众所周知，人体的肌肉与骨骼生长密切相关。最新研究显示，脂肪组织同样对骨骼发育起着重要的作用，而且这一作用在女孩子身上尤为明显。

It has long been known that the amount of muscle in the body is related to bone growth, but the new study shows that fat mass is also important in building bone, particularly in girls.

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时间的惟一作用是淘汰劣质书籍，因为只有真正好的文学著作才能流芳百世。

The only effect of time has been to sift out the bad products: for nothing in literature can long survive but what is really good.

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中国在国际舞台上作用日益重要，墨西哥愿与中国一道为共同营造更繁荣、更平等的世界而努力。

China is now playing an increasingly important role in the international arena, and Mexico will make efforts to work with China to create a more prosperous and equitable world.

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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