便衣警察的用法和樣例:
例句
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便衣警察在這位外國首腦進行國事訪問期間混入在人群中以防騷亂。
Policemen in plain clothes intermingled with the crowd to prevent trouble during the foreign ruler's state visit.
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有個便衣警察整天秘密監視那個罪犯。
A policeman in plain clothes shadowed the criminal all day.
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