They should make sure they put the used plastic bags into the dustbin when they want to dispose of them.

他们应该确保已使用过的塑料袋丢进垃圾桶，当他们要处理的时候。

youdao

They should make sure they put the used plastic bags into the dustbin when they want to dispose of them.

他们应该确保已使用过的塑料袋丢进垃圾桶，当他们要处理的时候。

youdao