长度

世界各地使用过许多不同的长度单位。现代使用的主要单位是美国的美制单位和其他地方的公制单位。英国帝国单位仍然用于英国和一些其他国家的某些目的。公制系统分为 SI 单位和非 SI 单位。

Many different units of length have been used around the world. The main units in modern use are U.S. customary units in the United States and the Metric system elsewhere. British Imperial units are still used for some purposes in the United Kingdom and some other countries. The metric system is sub-divided into SI and non-SI units.