英语连字符用法

题目

英语连字符用法
100 meters race转换后是
100-meter-race 还是 100-metre race?
是 three-metre-deep 还是 three-metre deep?
是 two-year-old-boy 还是 two-year-old boy?
一般连字符要用多少个?或者是用在什么词之后?

答案

100-metre race
two-year-old boy
因为100-metre 和two-year-old 分别是来修饰race 和boy 的,但是那一个应该是three-metre-deep,意思是“3米深的”