clean negotiable bill of lading

例句：

1. 1.Please clean up after yourselves.
   请在你自己的事情做完后清理一下。
2. 2. The roomneeds to be cleaned thoroughly before the guestsarrive.
   客人到来之前，房间需要彻底打扫一遍。
3. 3. The cleaners will come tomorrowto clean the carpets.
   清洁工明天来打扫地毯。