每周一听——那些年我们一起练过的听力（第145期）

[box=white]

每周一听——那些年我们一起练过的听力（第145期）

如果对本活动有兴趣就收听我吧！！！

    注意：参与活动的虫子请把自己的答案以站内信形式发送给我，并在活动帖里占位回复，方便评分，下周六下期活动发布之前有效哦。还有其他不懂之处，请在此帖里面直接留言回复，我们将尽快回答。
    PS：站内信的发送方式为：点击我的用户名（杜小丫个人主页https://muchong.com/bbs/space.php?uid=1917265 ），将答案输入对话框点击发送即可。别忘记回帖占座喔！
奖项——听写后正确填空者可得BB奖励
评分规则：
每篇设空十处，每答对一空奖励一个BB，全对的虫子可得15个BB奖励。有好的建议大家可以跟帖留言，加油哦~~~~~~

        When you turn a car's steering wheel, whether you go forwards or backwards. So it seems like it should be just as easy to steer going backwards as going forwards.But clearly,it's not. Suprisingly,the difficulty of driving backwards has almost nothing to do with the direction you're facing and everything to do with the fact that you steer using the front wheels.

      When driving forwards,a car goes in the direction the front wheels are pointed.And when driving backwards,the car goes where the back wheels are pointed.Simple!But the difference is that going forwards,the direction of travel is     (1)    by the same wheels you steer with,so you just point them where you want to go,and that's where you go,the back wheels follow    (2)    .

       In physics,we call this a "stable"system.like dangling a pencil from your fingers-move your hand around and the pencil follows,no thought   (3)    .However,when driving backwards,the direction of travel is determined by the back wheels but you steer with the front wheels.

        So rather than just pointing the front wheels where you want to go,you have to point them in the direction that will get the back wheels to point in the direction you want to go-it's an   (4)    level of separation before the car does what you want.

        And in fact,if you don't make any   (5)    ,then over time the back wheels point farther and farther away from the direction you want to go:instead of following the front wheels,they want to run away!This is an unstable system,like trying to balance a pencil on your fingertip.It's  (6)    finicky and requires a ton of coordinated hand-eye feedback to maintain.

       That's why you   (7)    have to readjust your steering when driving backwards-mathematically,your car is like an upside-down pencil! Of course,there are some successful rear-steering wheeled vehicles-forklifts,for example,only drive slowly and choose rear-steering for greater control of their forks.

        But let's go in the other direction and add a TRAILER to your car steering backwards has gained ANOTHER level of difficulty:you use your front wheels to get the back wheels to point in the direction needed to get the TRAILER to point in the direction you want to go.Not   (8)    enough?It becomes worse the more trailers you add each one adds another level of separation between the direction of your steering and the   (9)    direction of travel.

       Which is why it's nearly impossible to push on one end of a chain or a rope and have the other end go where you want it to,and why you will never,ever (10)    a flexible rope or chain upright on your finger.which makes backwards driving seem downright easy!

上期答案
1 Smartphone
2 strategy
3 trick
4 presented
5 developed
6 logs
7 For instance
8 hidden
9 ultimately
10connected

[/box]

下载提醒：APP中打开可直接下载，点击下载

• 145.mp3

 返回小木虫查看更多