C 米 a unit for measuring length

　cubic ～　立方米
　square ～　平方米

　1000 metres is a long distance. 　1000米是一段很长的距离。
　140 million square metres of floor space of new housing has/have been built, about seven times the amount that existed in 1989.　新建筑房屋的面积为1亿4千万平方米，是1989年的7倍。
1.5 million cubic metres of earth were/was moved.共搬运土方150万立方米。
　This swimming certificate is to certify that I swim one hundred metres.　这张游泳证证明我可以游100米。
　They erected a 2-metre-high mud wall on the windward side.　他们在迎风的一边筑起了一堵两米高的土墙。
　It fell out that Group One won the 400 metres relay race.　结果第一组得了400米接力赛第一名。

1. 我们将给你报名参加百米赛。
　［误］ We shall enter you for the 100 metre race.
　［误］ We shall enter you for the 100-metres race.
　［正］ We shall enter you for the 100 metres race.
　［正］ We shall enter you for the 100-metre race.
　［析］ metre是可数名词，与基数词连用时要用复数，如果是用连字符相连，则用单数。
2.5000米很远。
　［误］ 5000 metres are a long distance.
　［正］ 5000 metres is a long distance.
　［析］ metre用作主语时，常被视为一个整体，谓语动词常用单数形式。

　［词源］　拉丁语metrum（米）