同根派生 plain clothes man相关词英汉例句A policeman in plain clothes shadowed the criminal all day.有个便衣警察整天秘密监视那个罪犯。Suddenly, many plain policemen emerged and those robbers started to flee.突然间很多便衣警察出现了,这些强盗开始逃跑了。plain clothes man更多例句