n.拾荒者；食腐动物；清除剂
He's just fit for a job as scavenger. 他只配当个清道夫。
The shark is usually a scavenger rather than a hunter. 鲨鱼通常是一个清道夫，而不是一个猎人。
Proanthocyanidin is a effective natural free radical scavenger. 原花青素是一种天然有效的自由基清除剂。
