as clean as a whistle 非常干净，没有污点

表达“as clean as a whistle 像口哨一样干净”用来形容事物极其干净或某人没有任何前科或污点”。在使用时，可以直接说人或物“clean as a whistle”。关于这个说法的起源有很多，有人认为“as clean as a whistle”曾用来形容剑划过物体时发出的清澈的声音，也有人称，它源于人们吹奏芦苇或木制哨子时所发出的清脆声音。

例句

I've never even been issued a speeding ticket – my driving licence is clean as a whistle.

我从来没收到过一张超速罚单，我的车本上一分都没扣，毫无污点。

Jen is a bit of a neat freak. She keeps her desk clean as a whistle.

珍是一个酷爱整齐的人，她的办公桌总是打扫得极其干净整洁。

You've really tidied it up here – it's as clean as a whistle!

你真的认真地做了扫除，这里看起来特别干净！