1. Britain changed to a metric system of currency in 1970.
   1970年英国已改用公制货币.
2. Metric unit is a measuring unit used internationally.
   公制单位是国际通用的计量单位。
3. We need about 200 metric tons.
   我们需要大约200吨。
4. Most industry has used the metric system for years.
   大多数工业多年来一直用公制。
5. Gram is a metric unit of mass.
   克是米制质量单位。

　1个名词解释