当你运动时，你应该要让自己看起来好看并且感觉舒服。

You deserve to look good and feel good while you exercise.

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当你运动时，一种叫脑内啡的物质被释放，让你感觉特别有活力，同时能降低你的食欲。

When you exercise, endorphins are released which make you feel more chirpy and also reduce the pangs for food.

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当你花90美元买一双耐克运动鞋时，只有一小部分的钱流入中国，到劳动者手中的就更少了。

When you spend $90 for a pair of Nike sneakers, only a fraction of it flows to China and even less to workers there.

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So you should know when you look at a graph like this what it's doing.

因此当你看到这样一个图表时,要知道它是怎样运动的

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Or a football player--when you're running down the field, why did you go to this way instead of that way ? when you're running down the field?

或者是问一个橄榄球运动员--当你在操场上奔跑时，你为什么要往这边跑而不是那边呢,当你在操场上跑的时候？

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It means, when you are accelerating upwards, as the elevator picks up speed, the reading on the spring will be more and you will feel heavy.

也就是说当你向上做加速运动时,就像电梯加速的时候,弹簧的读数会增大,你会觉得自己变重了

耶鲁公开课 - 基础物理课程节选