We believe that a force of about one hundred pounds was needed to pull the string all the way back on a long bow.

我们认为，拉动长弓上的弓弦大约需要100磅的力。

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Pull factors are those associated with the place of destination.

拉动因素是指与目的地有关的因素。

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John Hagel, author of The Power of Pull and other books, says Brynjolfsson and McAfee miss the reason why these jobs are so vulnerable to technology in the first place.

《拉动力》等书的作者约翰·哈格尔表示，布林约尔松和迈克菲没有考虑到为什么这些工作最容易受到科技的影响。

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And the trick to a puzzle box is there's a simple way to get out but you have to kind of pull on something, some special lever, to make it pop open.

这个谜笼的设计是这样的,只要小猫拉动一个东西,它就能够逃出去，拉动一个特殊的杠杆，迷笼就会打开。

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