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Mike and Tom are of the same height.为什么要加of,直接Mike and Tom a

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Mike and Tom are of the same height.为什么要加of,直接Mike and Tom are the same height.不就行了
这是一个语法点:be of + n.,例如:It is of importance = It is important.
句中height(身高)是名词,be (are)动词后不能直接加名词,但有了of就可以加名词(参照上例),所以,不能省略of.
除非,把are改为have,那就可以去掉of,如:Mike and Tom have the same height.