败类的英文译为 "scum"。这个词来源于拉丁语 "scūmārius"，意思是 "垃圾堆"。在古英语中，"scum" 还有 "渣滓、污泥" 的意思。

下面是一些例句：

He's the scum of the earth. 他是世界上最败类的人。

The city was overrun by the criminal scum. 这座城市被罪犯们侵略了。

The scum on the surface of the liquid must be removed. 液体表面的污泥必须被清除。