用作形容词,连字符后面的单位不用复数：four-metre deep 才正确.
正如 She is a ten-year old girl.句中的 year 一般.
如果不用连字符,就可以用复数表达深度.例如：
This end of the swimming pool is four metres deep.
英语数词:有“four-metres deep”这个形式的吗?
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