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为什么要加ofthese studies revealed that these vibrations were of

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为什么要加of
these studies revealed that these vibrations were of two types,compression or P waves and Shear or S waves,这里面"were of two types",为什么要加个of
为什么要加ofthese studies revealed that these vibrations were of
楼主,这个没有错的,而且用词相当精准!
of用于be动词后表示某人或某事物具有的特点或特性
例如：
The crisis faced over the next few months is of an entirely different scale...
接下来几个月内将要面临的危机规模将是无法相比的.
Both world wars were of unquestionable importance as economic events.
两次世界大战都是重要性无可置疑的经济事件.
再问： 如果不加of有没有错，如果没错，意思是否一样，谢谢！
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