A plastic bag was floating in the water.

一个塑料袋在水中漂浮。

He tied the ends of the plastic bag together.

他把塑料袋的两头系在一起。

You look like a plastic bag.

你看起来像是一个塑胶袋。

Because I don't use plastic bag!

因为我不使用塑料袋！

Put them into a plastic bag, ok?

把它们装进塑料袋里面，好吗？