We are gradually changing over to a completely metric system.

我们正逐渐换成完全公制。

Together with the kilogram, initially the mass of a decaliter of distilled water, it formed the basis of the metric system.

它和千克（10升蒸馏水的重量）一起构成了公制计量的基本单位。

All about... the metric system.

关于全部的公制度量衡系统。

Most countries adopt metric system.

大多数国家采用公制。

They are all part of the metric system.

他们是公制的一部分。