(as) clean as a whistle
US /əz ˈkliːn əz ə ˈhwɪsl/
UK /əz ˈkliːn əz ə ˈhwɪsl/

1.
一尘不染, 非常干净
completely clean or spotless
:
•
After she scrubbed the kitchen, it was as clean as a whistle.
她擦洗完厨房后,厨房一尘不染。
•
The car came back from the car wash as clean as a whistle.
汽车从洗车店回来时一尘不染。
2.
顺利地, 毫无问题地
without any problems or difficulties; smoothly
:
•
The whole operation went as clean as a whistle.
整个行动顺利进行。
•
He got through the interview as clean as a whistle, answering every question perfectly.
他顺利地通过了面试,完美地回答了每一个问题。
3.
清白无瑕, 合法正直
without any illegal or immoral actions; legally and honestly
:
•
The politician's record was found to be as clean as a whistle after the investigation.
调查后发现,这位政治家的记录清白无瑕。
•
He swore his business dealings were as clean as a whistle.
他发誓他的商业交易清白无瑕。