Can you bend your thumb backwards until it touches your wrist? If you join your hands behind your back, can you lift them over your head without letting go?
你是否能将大拇指向后弯曲直至其触碰到手腕部位？你将双手在背后紧握，是否能够将其举过头顶而不松手？
You can neither sit down nor bend over without making some kind of noise.
你不发出点声响就坐不下来，腰也弯不下来。
If you ask her to help in the project, she is certain to bend over backwards to do whatever she can.
如果你请她帮忙搞这个工程，她肯定会竭尽全力地帮助你。
This is why your bottom moves backwards when you bend over, so that your centre of gravity can still remain over your feet.
这就是为什么你的底部向后移动时，你弯腰时使你的重心仍在你的脚下。
This is why your bottom moves backwards when you bend over, so that your centre of gravity can still remain over your feet.
这就是为什么你的底部向后移动时，你弯腰时使你的重心仍在你的脚下。
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