1、clean过去式：cleaned。

2、翻译：洁净的；干净的；爱干净的；爱整洁的；无有害物的；无污染的。

3、例句：It is your responsibility to keep the room clean and tidy .保持房间整洁是你的职责。

4、I can't find a clean shirt (= one I haven't worn since it was washed) 我找不到一件干净的衬衫。