回油的英文：
scavenge

People hate the scavengers such as rats.
人们讨厌老鼠之类的食腐动物。

A scavenger takes a break.
一名拾荒者在休息。

The invention discloses a scavenging agent for scavenging chewing gum residual.
本发明公开了一种清除口香糖残渣的清除剂。

No squirrels are known to hunt vertebrates, or even scavenge meat.
没有发现有松鼠猎取脊椎动物，或者以肉为食。

He's just fit for a job as scavenger.
他只配当个清道夫。