因为重力是，唯一作用的力。

Because gravity is the only force that does work.

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东方饮食结构中的一些成分能够保护心脏，但酱类中的高钠成分则又会抵消这一作用。

While some components of the Oriental diet may protect against heart trouble, the higher sodium content of sauces counter that benefit.

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但是研究者们发现，看电视起不到这一作用——在电视机前消磨大量时间反而可能加速失忆。

Watching TV however does not count — and indeed spending significant periods of time in front of the box may speed up memory loss, researchers found.

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So, what we're looking at here is the force when we have two charged particles, one positive one negative -- here, the nucleus and an electron.

我们现在研究的是,一正一负俩个带电粒子之间的,作用力-在这里。

麻省理工公开课 - 化学原理课程节选

They're making that because you need this protein insulin, it's a hormone, and it's important for sugar metabolism in your body.

它们产生胰岛素蛋白是因为你需要它,胰岛素是一种激素,它在糖代谢中起着非常重要的作用

耶鲁公开课 - 生物医学工程探索课程节选

There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.

我们复习一下大一,学过的功的概念：,物体在力的作用下，运动了一段距离。

麻省理工公开课 - 热力学与动力学课程节选