Have you seen the 10 metres high waves when at the sea?10 metres→10-metre

发布时间：2020-08-17 13:47:08

Have you seen the 10 metres high waves when at the sea?10 metres→10-metre 

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(答案→)10 metres→10-metre 
解析：合成形容词作前置定语，名词用抽象形式。
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