太阳的旋转周期是，26天，地球是一天，最后把一切转化成，米千克秒的单位，得到旋转动能的数据。

Well, the sun rotates about its axis in 26 days, the earth in one day, and so I finally convert everything to MKS units and I find these Numbers for the rotational kinetic energy.

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现在我们已经把单位确定了-，有了米，秒、千克-，我们可以开始测量了。

So now that we have agreed on the units — we have the meter, - the second and the kilogram — we can start making measurements.

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在物理学研究中除了国际单位制外，其它如厘米•克•秒和米•千克•秒单位制也使用。

Aside from the si system, other systems such as CGS and MKS are in use in the study of physics.

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Occasionally, you'll find you need to cancel out units, because, of course, you're always doing unit analysis as you solve your problems, and sometimes you'll need to convert joules to kilogram meters square per second squared.

偶然地，你会发现需要消除单位，因为在解题时,经常要做单位分析，所以有时候需要把,焦耳换做,一千克乘以米的平方除以秒的平方。

麻省理工公开课 - 化学原理课程节选

The seconds cross out, the kilograms cross out, one of the meters crosses out from the top, so we're left with an answer in meters.

秒消掉了，千克消掉了，单位米和上面的一起约去了，所以我们得到的答案只剩下米。

麻省理工公开课 - 化学原理课程节选

A joule is a kilogram meter squared per second squared.

一个焦耳等于,一千克乘以米的平方除以秒的平方。

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