是介词
It is a preposition.
以上为机器翻译结果,长、整句建议使用 人工翻译 。
这个星期的课堂主题是介词。
This week the class has been covering the topic of prepositions.
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英语是介词的语言。
English is a language of prepositions.
这数学家总是锁着门在书房工作。(这句是介词宾语的补足语。)
The mathematician always works in his study with the door locked.
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