[词典] serve as; act as; play the part of; pose as; [例句]她不得不去那户人家充当佣人。She had to go into service of that family.
who, which也可以充当两个成分。who可以作主句的成分:谁(疑问句)Who are you?从句中:I don't know who you are.which: 主句:哪一个 Which do you like better, this one or that one?从句中:The book which I bought last week is now lost.
充当可以理解为“被当作”的意思,比如说,某个单词充当谓语,可以理解为某个单词被当作谓语来使用.
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