无一例外地，这些人都体验到了失重和身体被纵向拉伸的感觉。

Uniformly, these people experienced weightlessness and the sensation that their bodies were being stretched lengthwise.

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一个德国教授认为，肌肉酸痛是因为肌肉拉伸的方式与平常有所不同，例如，长时间没有骑自行车之后再骑车兜风就会产生肌肉酸痛。

According to a German professor, the soreness comes from straining your muscles in an uncommon way. For example, jumping on a bicycle for a ride, because you haven't ridden in a long time.

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推挽式是一种有张力拉伸的环状结构。

Push-Pull has a tension loop structure.

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I draw a graph here of the amount by which I pull the spring versus the force it exerts.

我在这里画个图,纵轴是弹簧的拉伸量,横轴是力的大小

耶鲁公开课 - 基础物理课程节选

Newton is not going to come and tell you what force the spring will exert when it's pulled by some amount.

牛顿不会过来告诉你,弹簧被拉伸一定量时会产生多大的力

耶鲁公开课 - 基础物理课程节选

We want to know how much force it exerts when I pull it by a certain amount.

我们想知道当我们将弹簧拉伸一定量时,它能产生多大的力

耶鲁公开课 - 基础物理课程节选