便衣警察的用法和样例:
例句
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便衣警察在这位外国首脑进行国事访问期间混入在人群中以防骚乱。
Policemen in plain clothes intermingled with the crowd to prevent trouble during the foreign ruler's state visit.
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有个便衣警察整天秘密监视那个罪犯。
A policeman in plain clothes shadowed the criminal all day.
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