In the UK, the yard was considered the base unit of length.

在英国，码被认为是基本的长度单位。

Interestingly, one of the standard base units is derived from an actual value though not a universal one.

有趣的是，其中一个标准基本单位源自实际值， 但不是通用值。

So, in 2019, the base units that make up the foundation of the metric or SI system were redefined to no longer rely on imperfect human artifacts.

因此，在 2019 年，构成公制或 SI 系统基础的基本单位被重新定义为不再依赖不完美的人类工件。

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，您是否知道国际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？