Whatever do you mean by that?中的by是什么用法

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/08/29 03:31:55

Whatever do you mean by that?中的by是什么用法
是不是类似catch sb.by his arm.
能不能解释下这里by的用法

这个是英语当中一个固定的搭配,Whatever do you mean by ……询问对方是什么意思,by就是为了引出询问的具体对象.
catch sb.by his arm.中 by是为了说明抓住的是具体哪一部分.
楼主,这种都是固定搭配,在英语中,有很多这种,一定要牢记.
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