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他不由自主地笑了一下。用英语怎么说？

他不由自主地笑了一下。

He gave an involuntary smile.

相关词汇
he gave an involuntary smile

he

pron. 他，它，一个人；n. 雄性动物；

gave

v. 给予，赠送( give的过去式 )，（与名词连用描述某一动作，意义与该名词相应的动词相同），供给，交给；

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

involuntary

adj. 无意识做出的，非故意的，非自愿的，不随意的，不由自主的；

smile

n. 微笑，笑容；vt. 以微笑表示，以微笑完成；vi. 微笑，赞许，不在乎；
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