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1·Three officers in plain clothes told me to get out of the car.

三名便衣军官叫我从车上下来。《柯林斯英汉双解大词典》

2·She's in plain clothes.

她的穿着很朴素。

3·She always wears plain clothes to work.

她总是穿朴素的衣服去上班。

4·Plain clothes are appropriate for school wear.

朴素的衣服适合于上学时穿着。

5·There were policemen in plain clothes in the crowd.

人群中有穿着便衣的警察。

6·The policemen disguised themselves in plain clothes.

警察穿上便服伪装自己。

7·Plain clothes policeman who work undercover to detect crime.

隐蔽调查犯罪的便衣警察。

8·Another hypothesis suggests that boring always dresses in plain clothes and boring work.

还有一种假设认为无趣的人总衣着普通，无趣地工作。

9·He dress in plain clothes and drives an old car. Who would know he is the richest man in town?

他衣着普通，开一辆旧车，谁会想到他是小镇上最富有的人啊？

10·Angela: he dresses in plain clothes and drives an old car. Who would know he is the richest man in town?

安吉拉：他穿着很平常，开着一辆旧车，谁会想到他是这个城里最富有的人呢？