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

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/20 20:23:05
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
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!