The international foot measurements are based on the meter.

英尺的测量单位是米。

But in the official International System of Units, we use Joules.

但在正式的单位制中， 我们使用焦耳。

SI units are the International System.

SI 单位是单位制。

Well the answer is grave. Or rather 'grave' as it would have been pronounced in the original French.

答案是坟墓。其实是原法语发音为'grave'。 （坟墓的英语单词也是grave）最初，grave是测量质量的主单位。

Scientists generally measure pressure with the S.I. unit of force: Newtons per area, meters squared, which is shortened to pascals.

科学家们通常用的量单位 来测量压强: 牛顿平方米，简称帕斯卡。

For example, did you know that the International System of Units only includes seven base units and every other unit is derived from those units?

例如，您是否知道单位制仅包含七个基本单位， 而其他所有单位均源自这些单位？

It is the only thing in the entire universe with a mass of exactly one kilogram because it IS the kilogram. It is also the only SI unit that is still defined by a physical object.

这是全宇宙中唯一一个质量为一公斤整的物质，因为它就是“一公斤”。 公斤同时也是唯一一个用一个指定物质定义的主单位。