否则，你的身体就适应了那些一成不变的方法，而不能继续提升身体素质。

Otherwise, your body adapts to doing the same exercise over and over, and it stops improving.

youdao

姆法登说：“我不怕变老，如果你不变老，那你肯定在年轻的时候就已经去世了”。

McFadden says, "I don't fear age. If you don't get old, you die young.

youdao

你拥有这些法则就足够了，让它们成为永恒不变的法则吧。

Let these principles be enough for thee, let them always be fixed opinions.

youdao

Maybe you don't control thermostats in your dorm room, some of you do and some of you don't probably, and maybe it doesn't work very well so it might not be a good example, but imagine a perfect thermostat that you set for a temperature and then the temperature stays the same inside the room no matter what the temperature is outside.

可能你根本就不理卧室里的恒温器,有些人去调它,有些人就置之不理,可能它压根就是坏的,所以这个例子也许并不恰当,但你还是想象一个完美运行的恒温器,你设定温度后房间里的温度就保持不变,不管外面温度是多少

耶鲁公开课 - 生物医学工程探索课程节选