counterintuitively,counterintuitive是什么意思,counterintuitive中文翻譯,counterintuitive發(fā)音、用法及例句
?counterintuitive
counterintuitive發(fā)音
英:[ka?nt?r?n'tju:?t?v] 美:[?ka?nt?r?n'tju:?t?v]
英: 美:
counterintuitive中文意思翻譯
adj. 違反直覺的
counterintuitive詞形變化
名詞: counterinsurgent |
counterintuitive常見例句
1 、That's not well known even by some veteran webmasters, because it runs counterintuitive to what we've come to expect from experience.───這對(duì)于某些網(wǎng)管老手來說都很陌生,因?yàn)橐晕覀兊慕?jīng)驗(yàn)來判斷,它不太合理。
2 、It's completely counterintuitive compared to what most cities do.─── 這與絕大部分城市的做法背道而馳
3 、That seems counterintuitive, which makes it a common mistake.───這是常見的錯(cuò)誤,看起來是違反直覺的。
4 、It's a bit counterintuitive, considering the internet's made more articles available than ever before.───這似乎有悖常理,因?yàn)榛ヂ?lián)網(wǎng)的產(chǎn)生應(yīng)該讓人們能閱讀到比以往更多的文獻(xiàn)才對(duì)。
5 、While the results may seem counterintuitive, researchers conclude that extending nursing time can actually interrupt a mother’s internal system for milk production.───雖然結(jié)果很出乎意料,研究者們給出了一個(gè)結(jié)論:實(shí)際上,因?yàn)橐圃烊橹?,過長(zhǎng)的哺乳時(shí)間會(huì)擾亂一位母親身體的內(nèi)部系統(tǒng)。
6 、This is counterintuitive to most investors.Mr.───大部分投資者的直覺看法都不是這樣。
7 、is a counterintuitive illusion. When a grey rectangle is mainly surrounded by black it should look lighter. In this case, the grey rectangles are exactly the same shade of grey.───當(dāng)灰色的長(zhǎng)方形被黑色圍住,它看起來會(huì)更亮。該圖中兩邊的灰色深度其實(shí)是一樣的。
8 、Critical thinking is often counterintuitive, and our brains are easily fooled.───批判性思維常常是違反直覺的,而我們的大腦是很容易被愚弄的。
9 、That’s kinda counterintuitive but Ki Baek and co say several factors explain what is going on.───這可能非常有趣如果你這幾天在圣地亞哥的高速公路上試試看的話。哈哈!
10 、The gravitational interaction of a satellite and a nearby particle is somewhat counterintuitive.───衛(wèi)星和鄰近粒子之間的重力作用有些違反直覺。
11 、Counterintuitive Sequencing of Planning Tasks───反直覺規(guī)劃
12 、But of course what makes investing so counterintuitive is that in equity markets, good times are defined as everyone thinking it's time to buy.───但是在資本市場(chǎng)確實(shí)讓投資行為變得非常違反直覺,所謂牛市是人人都想著買進(jìn)的時(shí)期。
13 、This finding may seem counterintuitive , since many smokers attest to feeling more alert and focused after smoking.───這一發(fā)現(xiàn)似乎和我們的直覺正好相反,因?yàn)楹芏嗳硕加X得在抽完煙后反應(yīng)會(huì)更敏捷,注意力更集中。
14 、I know it's counterintuitive, but trust me on that.─── 我知道這反直覺 但是相信我
15 、But other signs also could point the way, they say. They range from the innocuous (such as trading volume) to the counterintuitive (cuts in profit expectations).───但他們稱,還有其他指標(biāo)能夠幫助他們得出結(jié)論,其中既包括交易量等普通指標(biāo),也包括盈利預(yù)期下調(diào)等違反直覺的情況。
16 、It's important to do this.It seems counterintuitive, it seems like gulping would cause a cramp.───這很重要,似乎違背直覺,似乎大口喝會(huì)引起腹部絞痛。
17 、When we do that then there are often quite counterintuitive results.───當(dāng)我們做到這一點(diǎn)則往往是非常違反直覺的結(jié)果。
18 、It's counterintuitive, so let's go over all the details.───這與你的直覺是相反的,讓我們來看一些細(xì)節(jié)。
19 、And they should never be the same, because, however counterintuitive this may seem, to make them the same would be to fundamentally weaken the opportunity for new creators to create.───因?yàn)樘热魶]有區(qū)分的話,這會(huì)從根本上弱化新手進(jìn)行創(chuàng)新的機(jī)會(huì),盡管這個(gè)理由不是很能夠被直觀地看出。
20 、Keywords: Counterintuitive Sequencing of planning tasks; development planning; institutional resistance; substantive and procedural planning theories; unorthodox problem formulation───關(guān)鍵詞:反直覺規(guī)劃;發(fā)展規(guī)劃;制度阻力;本體論和程序規(guī)劃理論;非常規(guī)問題闡述
21 、It's barely a taste of the radical and often counterintuitive "rules" that Kelly dishes out.───這只不過是品嘗凱利所推出的那些激進(jìn)且經(jīng)常是反直覺的規(guī)則的一點(diǎn)味道而已。
22 、"Further research is needed to explain this counterintuitive finding and to identify more effective methods of medication review.───他們認(rèn)為,需要未來進(jìn)一步的試驗(yàn)來解釋這項(xiàng)違反直覺的發(fā)現(xiàn),以及確認(rèn)出藥物評(píng)估更有效的方式。
23 、A thought experiment designed to illustrate the counterintuitive and strange notions of reality that come along with quantum mechanics.───隨著量子力學(xué)而出現(xiàn)了違反直覺和有著奇怪概念的事實(shí),為了闡述它們而進(jìn)行了一個(gè)理想實(shí)驗(yàn)。
24 、We hope to present evidence that such instruction can lead to conceptual change in that the student can make intuitive sense of aspects of the scientific theory that were counterintuitive before.───我們希望提出證據(jù),這種指示可能導(dǎo)致概念上的變化的學(xué)生可以直觀的感覺方面的科學(xué)理論,是違反直覺面前。
25 、I know it's counterintuitive, but that's the point.─── 我知道聽起來完全背道而馳 但確實(shí)如此
26 、This view may seem very counterintuitive at first.───這個(gè)觀點(diǎn)也許第一眼看起來是非常反直覺的。
27 、That's counterintuitive, but that just might work.─── 有點(diǎn)不合套路 但沒準(zhǔn)還真能管用
28 、Counterintuitive rules are difficult to learn and not fun, at least at first.───怪誕的規(guī)則通常都不容易掌握,也并不有趣,至少一開始是這樣。
29 、The most important findings are rather counterintuitive: Smaller firms are more successful than larger firms, and firms entering more open emerging markets have less success.───研究結(jié)果非常令人意想不到:小公司比大公司更成功,而那些進(jìn)入更加開放的新興市場(chǎng)的企業(yè)更少獲得成功。
30 、It's an almost counterintuitive question: Can the physically disabled become artists?───有身體缺陷的人能夠成為藝術(shù)家么?
31 、Brand also makes a counterintuitive case that the booming slums and squatter cities in and around Mumbai, Nairobi, and Rio de Janeiro are net positives for poor people and the environment.───布蘭德也為窮人和環(huán)境提出反直覺的理由,在孟買、內(nèi)羅畢和里約熱內(nèi)盧市內(nèi)及其四周急速發(fā)展的貧民窟和寮屋城區(qū)純屬積極正面。
32 、It might seem counterintuitive to discuss the application architecture last, but doing so makes sense with this type of development.───到最后才討論應(yīng)用程序架構(gòu)看起來可能不合常規(guī),但是對(duì)于這類開發(fā)來說這么做是有意義的。
33 、Initially, it seemed quite counterintuitive to me.───最初它對(duì)我來說也是反直覺的。
34 、It is, of course, a very tricky task to devise a romanization method;some are better than others, but all involve plenty of counterintuitive spellings.───當(dāng)然,要發(fā)明一種羅馬式拼音方案確是一項(xiàng)技巧性很強(qiáng)的高難度工程,盡管各種方案各有千秋,但任何方案都無法憑直覺來拼讀。
35 、Moreover, their leptin levels are actually higher than those of lean individuals, which sounds counterintuitive if leptin is supposed to cause appetite suppression.───再者,他們體內(nèi)的瘦身素量也比體瘦者高。如果說瘦身素的作用是抑制食欲,那麼這個(gè)發(fā)現(xiàn)似乎有違常理。
36 、It’s counterintuitive, but it can be proven easily with elementary mathematics.───這是違反直覺的,但這卻可以很容易的用初等數(shù)學(xué)來證明。
37 、“It would be counterintuitive to disengage, and potentially lose, the most important sector of your workforce and the future of your company in order to cut short-term costs.───因此,為減少短期性的費(fèi)用支入,企業(yè)更不能憑直覺裁員或削減間接費(fèi)用,而是該把重點(diǎn)放在員工穩(wěn)定性及企業(yè)的未來規(guī)劃上來。
38 、Metamaterials can and have been designed and made to possess certain properties, even counterintuitive ones.───超穎物質(zhì)可以并已經(jīng)用來設(shè)計(jì)具有某種特性,有些甚至是和人的直覺相違背的特性。
39 、Many legitimate wave functions correspond to counterintuitive situations, such as a cat being dead and alive at the same time in a so-called superposition.───許多合法的波函數(shù),對(duì)應(yīng)的卻是違反直覺的狀況,比如一只貓?jiān)谝粋€(gè)所謂的疊加態(tài)中,竟同時(shí)是生又是死的。
40 、The facts are counterintuitive to everything else you see around you.───事實(shí)是對(duì)于你在你周遭所見到的其他每件事物是違反直覺的。
41 、The papers in this STF develop counterintuitive theory about the circumstances of those private firms developing different corporate strategies to influence government policy.───他們認(rèn)為管理學(xué)的學(xué)者們剛開始涉足這一重要的論題并提出一些可行的研究方向。
42 、This fact may be counterintuitive - it seems reasonable to suppose that you would reach an asymptote once almost all the English words had been included.───這個(gè)事實(shí)可能與我們的直覺相反認(rèn)為一旦全部包括了幾乎所有的英文單詞,您就可以一勞永逸,這似乎很合乎情理。
43 、A trader who expects a downswing must decide which put to buy. The best choice is counterintuitive and different from what most people get.───期待下跌的交易者要決定買什么樣的看跌期權(quán)。最好是和直覺不同的,和別人不一樣的。
44 、But too many of the book's vaguely counterintuitive examples ... stray from the central theme, giving their argument a shapeless, meandering feel.───但是這本書舉了太多含糊的悔澀的例子...偏離了中心論點(diǎn),讓他們的觀點(diǎn)看起來散漫不成型?!?/p>
45 、It's just that the ethic rules for the governor can be quite counterintuitive.─── 只是關(guān)于州長(zhǎng)的**準(zhǔn)則 其實(shí)相當(dāng)有悖常理
46 、It seems counterintuitive that doing nothing can make you fatigued, but it's true.───乍聽起來有些奇怪:什么都不做竟會(huì)讓你感到疲倦,但其確實(shí)是真理。
47 、PersevereInteresting and perhaps counterintuitive fact: research shows that people tend to persevere longer with problems that they've been told are difficult, as opposed to easy.───有趣卻違背人們一般認(rèn)為的事實(shí)是:據(jù)研究表明往往在被認(rèn)為是”困難'的問題上人們堅(jiān)持的時(shí)間比在“容易”的問題上更長(zhǎng)。
48 、S. alone-diet industry.Niedenthal says that not only has he lost 12 kg in 18 months on his counterintuitive diet regime, "I have much more energy and my complexion has improved.───尼登特爾說,采用反常規(guī)飲食療法18個(gè)月以來,他的體重下降了12公斤,而且“覺得渾身更有勁,臉色也好了許多”。
49 、The rule for machines is counterintuitive but clear: Complex machines must be made incrementally and often indirectly.───對(duì)機(jī)器來說,這個(gè)規(guī)則是違反直覺的,但是很明確:復(fù)雜的機(jī)器必定是逐步地、而且往往是間接地完善的。
50 、China's need to emulate America may seem counterintuitive at the moment, given the parlous state of the U.S. economy.───在當(dāng)前的時(shí)刻,尤其是美國(guó)經(jīng)濟(jì)陷入困頓之際,提出中國(guó)應(yīng)該效仿美國(guó)似乎有悖直覺。
51 、When you run into an obstacle you can't overcome, you try a counterintuitive approach.─── 如果你遭遇了無法克服的障礙 你就采取逆向思維的辦法
52 、N. weapons inspectors on Iraqi weapons of mass destruction (WMD).To policymakers, a lack of WMD was counterintuitive and contrary to past experience.───對(duì)決策者而言,缺乏大規(guī)模殺傷性武器是違反直覺的,而且與過去的經(jīng)驗(yàn)相反。
53 、But much of physics is counterintuitive, as is the case in many other disciplines, and before the rise of modern science we had only our folk intuitions to guide us.───然而,物理學(xué)絕大部份是與直覺相違背的,其他學(xué)門也是如此。在現(xiàn)代科學(xué)興起之前,我們只有一般直覺可供引導(dǎo)。
54 、This conclusion, too, is counterintuitive and at odds with the terms of present law and most proposals for reform.───這個(gè)結(jié)論有點(diǎn)違反直覺,并且與現(xiàn)行法律和大多數(shù)改革建議所使用的術(shù)語(yǔ)不一致。
55 、Certainly, counterintuitive moves in airline stocks and others could present opportunities.───當(dāng)然,航空和其它類股的反常走勢(shì)可能帶來了機(jī)會(huì)。
56 、A similar result was discovered in an example so counterintuitive that it startles.───在一個(gè)非常違反直覺的例子中,也發(fā)現(xiàn)到相似的結(jié)果。
57 、What is it about our reflected self that it plays by such counterintuitive rules?───那我們根據(jù)這些與直覺相反的規(guī)則而變化的鏡中影像又怎麼了?
58 、At the same time, type-E dualism is frequently rejected as deeply counterintuitive.───同時(shí),E類二元論常常意味其反直觀而被拒絕。
59 、Tengzhong's interest in the gas-guzzling Hummer brand seems somewhat counterintuitive, as the company just entered the business of making wind-turbine gearboxes last year.───四川騰中重工看上油耗子品牌悍馬似乎有點(diǎn)不合常理,因?yàn)樵摴救ツ瓴艅倓傔M(jìn)入制造風(fēng)電齒輪箱的業(yè)務(wù)。
60 、A better idea, though counterintuitive, might be to raise tuition to all students but couple the raise with a program of rebates for graduates who work full time.───一個(gè)違背直覺的好主意:可以提高所有學(xué)生的學(xué)費(fèi),而不僅僅包括結(jié)了婚的,配套的計(jì)劃是將提高的部分返還給全職工作的畢業(yè)生。
61 、It's completely counterintuitive and simply doesn't make sense.─── 這完全違反我們的直覺 而且也說不通
62 、At first, all this seems counterintuitive - cutting trees to save a forest.───砍樹來拯救森林,最初以直覺想,似乎是說不通的。
63 、No matter how counterintuitive to traditional political thinking.─── 無論這些決策是否 與傳統(tǒng)*思維相左
64 、This sounds counterintuitive but within the logic of accounting it makes some sense.───這聽起來似乎違背常理,但從會(huì)計(jì)邏輯來說有一定道理。
65 、China's need to emulate America may seem counterintuitive at the moment, given the parlous state of the U.───鑒于美國(guó)經(jīng)濟(jì)危機(jī),現(xiàn)在說中國(guó)需要效仿美國(guó)好像是違反直覺的。
66 、So I know this sounds counterintuitive, but I would advise him to stick to the guilty plea.─── 所以 我知道這聽起來不可思議 但我會(huì)建議他堅(jiān)持原來的認(rèn)罪答辯
67 、Elements which are unrealistic are often counterintuitive.───那些不現(xiàn)實(shí)的游戲元素通常都很怪誕。
68 、While it may seem counterintuitive to drink hot liquids in the heat, many Asian cultures believe that doing so will increase sweating and help cool you off.───大熱天飲熱茶聽起來似乎有悖常理,但許多亞洲文化認(rèn)為這有助發(fā)汗解暑,可以清涼降火。
69 、This is exactly right, even though it’s often counterintuitive for people who program in other languages (especially C) and are used to accessing everything without restriction.───完全正確,這對(duì)于一些使用其它編程語(yǔ)言(特別指C語(yǔ)言),以及習(xí)慣于訪問任何部分而無任何限制的編程人員來說尤為如此。
70 、Forgas and his team weren't surprised by the result, although at first glance it might seem counterintuitive.───結(jié)果不出福加斯和他的小組所料,盡管乍看上去似乎有違直覺。
71 、A key to this counterintuitive approach to traffic design lies in manipulating the inherent self-interest of all drivers.───這種違反直覺的交通規(guī)劃,關(guān)鍵在于運(yùn)用每個(gè)駕駛?cè)说乃叫摹?/p>
72 、This sighting is counterintuitive to everything we know about its behavior.─── 這種現(xiàn)象與我們 對(duì)其所有行為的了解背道而馳
73 、Buying a very cheap, far-out-of-the-money put is counterintuitive.───買一個(gè)便宜的,不值錢的看跌期權(quán)是違反只覺的。
74 、“While it may be counterintuitive , it's more appropriate and in some ways more spiritually uplifting to be grateful in a time of need than in a time of plenty,” Mirel said.───在極其痛苦的經(jīng)濟(jì)困難時(shí)刻,很難想象在感恩方面有所作為。
75 、Nature, the master manager of complexity, offers priceless guidance in handling messy, counterintuitive webs.───自然,這掌控復(fù)雜性的大師,給我們提供無價(jià)的引導(dǎo)來掙脫雜亂、反直觀的網(wǎng)。
76 、Although the result appears counterintuitive and even surprising, it's a reasonable choice of the principal under the assumption of self-interested and rational behavior.───此一結(jié)論雖然不是那麼符合直覺,甚至有些令人意外,惟在**人自利與理性的行為假設(shè)下,其實(shí)并不難理解其隱含的經(jīng)濟(jì)意涵。
77 、Finally, although it might seem counterintuitive, one effective means of controlling our emotions about an investment is to avoid learning too much about it.───最后,盡管這可能看起來不合常理,一個(gè)控制投資情緒的有效方法是避免對(duì)投資知道的太多。
78 、Object variables that contain intrinsic variable types, such as integer, are displayed and edited in a manner that may appear counterintuitive.───包含內(nèi)部變量類型(如整型)的對(duì)象變量的顯示和編輯方式可能看起來不夠直觀。
79 、Counterintuitive as it may sound, Ehrlich told me in an e-mail that “l(fā)acking any other information, one would put (conservation) effort into the (species) with a small range.───在一封電子郵件里,歐利希跟我說了個(gè)聽起來有點(diǎn)違反直覺的觀點(diǎn)。他說:“如果缺乏其他相關(guān)信息,人們就只能在一個(gè)狹窄的范圍內(nèi)開展對(duì)物種的保護(hù)。”
80 、This may sound a little counterintuitive, but before a merger is completed, the company that is being acquired will pay, possibly prepay, as many expenses as possible.───這也許聽起來一少許反直觀,但在合并被完成之前,被獲取的公司將支付,可能預(yù)付,許多費(fèi)用盡可能。
81 、The middle class's newfound disdain for democracy is counterintuitive.───中產(chǎn)階級(jí)對(duì)民主新滋生出的輕視是有違常性的。
余同希的主要論著
1 TX Yu and W Johnson. The Plastica:the large elastic-plastic deflection of a strut. Int J Non-Linear Mech,1982,17,195~209
2 TX Yu and W Johnson. The large elastic-plastic deflectionwith springback of a circular plate subjected to circum-ferential moments. ASME J Appl Mech,1982,49,507~515
3 TX Yu and W Johnson. Cylindrical bending of metal strips.Metals Technology,1983,10,439~448
4 PS Symonds and TX Yu. Counterintuitive behaviour in aproblem of elastic-plastic beam dynamics. ASME J Appl Mech,1985,52,517~522
5 XQ Wu,C Liu and TX Yu. A bifurcation phenomenon in an elastic-plastic symmetrical shallow truss subjected to symmetricalload. Int J Solids Struct,1987,23,1225~1233
6 余同希. 塑性力學(xué),高等教育出版社,1989
7 TX Yu and WJ Stronge. Large deflection of a rigid-plasticbeam-on-foundation from impact. Int J Impact Engng,1990,9,115~126
8 XD Wang and TX Yu. Parkes revisited:effect of elasticdeformation at the root of a cantilever beam. Int J ImpactEngng,1991,11,197~209
9 余同希,章亮熾. 塑性彎曲理論及其應(yīng)用. 科學(xué)出版社,1992
10 WJ Stronge and TX Yu. Dynamic Models for Structural Plasticity. Springer-Verlag,London,1993
11 TX Yu. Elastic effect in the dynamic plastic response of structures,Chapter 9 in Structural Crashworthiness and Failure,ed. N Jones and T Wierzbicki,341~384,Elsevier,1993
12 余同希,華云龍. 結(jié)構(gòu)塑性動(dòng)力學(xué)引論. 中國(guó)科技大學(xué)出版社,1994
13 XY Su,TX Yu and SR Reid. Inertia-sensitive impact energy- absorbing structures. Part I:Effects of inertia and elasticity,Int J Impact Engng,1995,16,651~672
14 TX Yu,JL Yang,SR Reid and CD Austin. Dynamic behaviour of elastic-plastic free-free beam subjected to impulsive loading. Int J Solids Struct,1996,33,2659~2680
15 TX Yu and LC Zhang. Plastic Bending:Theory and Applications. World Scientific,Singapore,1996
16 TX Yu,JL Yang and SR Reid. Interaction between reflected elastic flexural waves and a plastic hinge in the dynamic response of pulse loaded beams. Int J Impact Engng,1997, 19,457~475
17 SR Reid,TX Yu and JL Yang. An elastic-plastic hardening- sodtening cantilever beam subjected to a force pulse at its tip:a model for pipe whip. Proc R Soc Lond A 454,1998,997~1029
18 TX Yu,XM Tao and P Xue. Energy-absorbing capacity of grid- domed textile composites. Composite Science and Technology, 2000,60,785~800
19 TX Yu and FL Chen. A further study of plastic shear failure of impulsively loaded clamped beams. Int J Impact Engng, 2000,24,613~629
20 TX Yu,QP Sun and JK Kim ed. Advances in Engineering Plasticity. Trans Tech Publications,Zurich,Switzerland,2000
研究工作主要集中于沖擊動(dòng)力學(xué)、塑性力學(xué)、結(jié)構(gòu)與材料的能量吸收、復(fù)合材料與多胞材料等領(lǐng)域。編寫出版了《塑性力學(xué)》(2010年再版易名為《工程塑性力學(xué)》)、《工程材料及其力學(xué)行為》、《結(jié)構(gòu)塑性動(dòng)力學(xué)引論》及《沖擊動(dòng)力學(xué)》等四部教材;著有《塑性彎曲理論及其應(yīng)
用》,《塑性結(jié)構(gòu)的動(dòng)力學(xué)模型》和《材料與結(jié)構(gòu)的能量吸收》等三部專著(都有英文版在國(guó)外出版);發(fā)表了學(xué)術(shù)期刊論文330篇(大都為SCI收錄)、國(guó)際會(huì)議論文200篇、專利4項(xiàng)。獲選為劍橋大學(xué)丘吉爾學(xué)院海外院士;美國(guó)機(jī)械工程師學(xué)會(huì)會(huì)士(Fellow)、英國(guó)機(jī)械工程師學(xué)會(huì)會(huì)士(Fellow)、香港工程師學(xué)會(huì)會(huì)士(Fellow);擔(dān)任國(guó)際沖擊工程學(xué)報(bào)(International Journal of Impact Engineering)副主編、國(guó)際機(jī)械科學(xué)學(xué)報(bào)(International Journal of Mechanical Sciences)副主編,以及十余種國(guó)際學(xué)術(shù)刊物的編委。曾任中國(guó)力學(xué)學(xué)會(huì)副秘書長(zhǎng)(1986-1994)、香港力學(xué)學(xué)會(huì)理事長(zhǎng)(2000-2002)和國(guó)際理論與應(yīng)用力學(xué)學(xué)會(huì)(IUTAM)理事會(huì)的香港代表(2003-2010)。2001年獲中國(guó)高校科學(xué)技術(shù)獎(jiǎng)一等獎(jiǎng)。
關(guān)于Countersteering--摩托車的推胎/推把
最近一些初騎摩托的朋友跟我討論到關(guān)于推胎/推把(Countersteering)的問題。坦白講,我一直都沒有認(rèn)真考慮過這個(gè)問題,只是憑感覺以傾斜身體為主來高速過彎。所以這一次我就細(xì)致地思考和學(xué)習(xí)了它背后的物理知識(shí),并在實(shí)踐中再次檢驗(yàn)。
什么叫做Countersteering / 推胎 / 推把呢?
如上圖,countersteering,顧名思義,“反向?qū)颉薄?Push left, go left; Push right, go right"最簡(jiǎn)單直白地形容,便是左轉(zhuǎn)推左把手,右轉(zhuǎn)推右把手。下面圖中的車手,進(jìn)入右彎,他推了右把手,從而使得前輪偏左:
Countersteering這件事情,一定程度上違背我們的直覺,因?yàn)楦鶕?jù)我們駕駛汽車和平時(shí)騎自行車的經(jīng)驗(yàn),打方向的手法應(yīng)當(dāng)是車頭方向同目標(biāo)方向一致——左轉(zhuǎn)時(shí)推右把手使得車頭往左,右轉(zhuǎn)時(shí)推左把手使得車頭向右。根據(jù)直覺來說,如果不推把手,那在兩輪車上,我們也應(yīng)當(dāng)是采取偏移重心(車/身體)向目標(biāo)方向的做法——左轉(zhuǎn)時(shí)左傾,右轉(zhuǎn)時(shí)右傾,而不是反直覺地countersteer。不過,如果不counterintuitive,這個(gè)技巧也不會(huì)叫countersteering了。
但其實(shí)客觀來講,推胎這件事,我們可能或多或少都做過或者見過,比如下面這張圖:
這位工作人員通過左推把手實(shí)現(xiàn)了左轉(zhuǎn),這便是非常典型的coutersteering。大家是否能回想起來自己自己有時(shí)候高速騎車/玩滑板車的時(shí)候,想要左轉(zhuǎn),卻一剎那間有些出乎意料的脫離控制的時(shí)候呢?那便多半就是我們第一次體會(huì)到countersteering/推胎的時(shí)候。
傾斜身體,移動(dòng)重心來過彎是符合直覺也不無道理的。我們來簡(jiǎn)單地復(fù)習(xí)一下初中物理。物體具有慣性,一個(gè)做勻速圓周運(yùn)動(dòng)的物體要保持勻速圓周運(yùn)動(dòng)而不是直線運(yùn)動(dòng),則需要外界的合力形成一個(gè)向心力F。微觀地看,物體的慣性會(huì)使得它從A運(yùn)動(dòng)到B,而向心力(外界合力)使得它從B到C,從而保持在圓周上:
我們假設(shè)時(shí)間為delta t,圓周半徑為r,速度表示為v,加速度表示為a,則有下面推導(dǎo),得到向心力F=mv^2/r:
很顯然,我們現(xiàn)在看“勻速圓周運(yùn)動(dòng)”的視角,并不是一個(gè)慣性參考系,所以接下來的受力分析,我們需要引入一個(gè)離心力(=向心力mv^2/r),才能繼續(xù)使用牛頓定律:
而很顯然,下圖中的f1和f2也是需要相等才能受力平衡的:
因此有該角beta = arccot (v^2 / (gr)):
所以我們過彎的時(shí)候,速度v越大,所需要的傾角theta = (90-beta)也就越大。從這個(gè)意義上講,與其說是我們通過傾斜來過彎,不如說過彎如果要保持速度,我們就不得不保持相當(dāng)?shù)膬A斜。
那么這一切跟推胎/countersteering又有什么關(guān)系呢?
引用一個(gè)百度百科的解釋:重力對(duì)高速旋轉(zhuǎn)中的 陀螺 產(chǎn)生的對(duì)支撐點(diǎn)的 力矩 不會(huì)使其發(fā)生傾倒,而發(fā)生小角度的 進(jìn)動(dòng) 。此即陀螺效應(yīng)。進(jìn)動(dòng)說一個(gè)自轉(zhuǎn)的物體受外力作用導(dǎo)致其自轉(zhuǎn)軸繞某一中心旋轉(zhuǎn)——注意,是轉(zhuǎn)軸旋轉(zhuǎn)。
首先想象一個(gè)轉(zhuǎn)軸垂直的陀螺,如果受到了水平方向的力使得支撐點(diǎn)不平衡,它的陀螺儀效應(yīng)(進(jìn)動(dòng))很容易想象:
而更通俗地說,我們可以認(rèn)為物體有一種保持原軸旋轉(zhuǎn)的慣性。而車輪旋轉(zhuǎn)速度越快,角速度越快,則角動(dòng)量(及動(dòng)量矩)也就越大,這種“慣性”就越大,也就越穩(wěn)定。這就是為什么高速騎行時(shí),更容易保持平衡的原因。
在彎道行進(jìn)的摩托車,如下圖所示,向心力和重力分別會(huì)對(duì)車輪產(chǎn)生一個(gè)力矩,實(shí)現(xiàn)了平衡:
從這里我們便可以想象出推胎的原理了:比方說一個(gè)想右轉(zhuǎn)的車手,現(xiàn)在車體和身體都保持正直,向前推了右車把,車頭偏左,此刻向左的向心力則有了一個(gè)力矩,迫使車身向右傾斜,而這正是我們高速右轉(zhuǎn)所需要的。這也就是說,因?yàn)樽筠D(zhuǎn)需要向左側(cè)傾斜,而在不傾斜的情況下,一個(gè)向左轉(zhuǎn)的傾向(車頭),會(huì)使得車身向反方向(右)傾斜,為車手所利用,進(jìn)行轉(zhuǎn)向。
同時(shí),因?yàn)橥勇輧x效應(yīng),我們轉(zhuǎn)動(dòng)車頭(前胎)時(shí),前輪產(chǎn)生進(jìn)動(dòng),這也是(向相反方向的)傾斜產(chǎn)生的一部分原因。
比較常見的說法,是高速騎行時(shí)(比如說至少12英里每小時(shí)以上的速度),countersteering才有必要使用。這是一種很直接的體會(huì),但是并不準(zhǔn)確。
根據(jù)上面的分析,我們已經(jīng)可以看到,countersteering的原理跟速度并沒有關(guān)系,所以本質(zhì)上,低速運(yùn)動(dòng)時(shí),countersteering也是可以使用的。但是我們?yōu)槭裁赐鶝]有注意到呢?容易想到,低速騎行時(shí),保持速度過彎需要的傾角非常小,我們很容易通過身體稍微傾斜來完成。并且,低速時(shí)我們會(huì)無意識(shí)地很頻繁地調(diào)整車頭,從而完全忽視了countersteering的存在。
在實(shí)際的騎行之中運(yùn)用countersteering是非常簡(jiǎn)單的——只需要記住"Push left, go left; Push right, go right"并執(zhí)行就可以了。當(dāng)然,我們要把一個(gè)違反直覺的操作變成直覺,這需要不斷的訓(xùn)練和用經(jīng)驗(yàn)說服自己。
不得不說的是,掌握countersteering,并將其變成肌肉記憶,對(duì)于騎行安全是一個(gè)關(guān)鍵點(diǎn)。因?yàn)樵谶^彎時(shí)如果速度非??欤徽撌且?yàn)槿霃澢皽p速不到位也好,還是沒有預(yù)知到這個(gè)彎道也好,我們都需要維持一個(gè)更大的傾角來過彎——因?yàn)榇藭r(shí)減速造成騎行不穩(wěn)定這一風(fēng)險(xiǎn)其實(shí)更大。但是這一點(diǎn)在速度過快,我們有些失去冷靜的時(shí)候是很難做到的——本來就在一個(gè)狹窄的陡彎30mph地過彎,沒有及時(shí)減速的騎手有些失去了自信,此時(shí)還要往彎道相反的方向推車把。在緊急關(guān)頭保持冷靜做出正確判斷,是很難得的素質(zhì),所以我們最好的做法,就是為自己培養(yǎng)出countersteering的本能,讓我們的應(yīng)急反應(yīng)成為正確反應(yīng)。
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