scavenger

scavenger
noun
  1. an animal that feeds on carrion, dead plant material, or refuse
    食腐动物
    ■a person who searches for and collects discarded items
    捡破烂的人
    ■(Brit., archaic)a person employed to clean the streets
    (英，古)清道夫
    ■(Chemistry)a substance that reacts with and removes particular molecules, radicals, etc
    (化)（通过化合作用的）清除剂；净化剂
scavengery
noun
语源
  1. mid 16th cent.: alteration of earlier scavager, from Anglo-Norman French scawager, from Old Northern French escauwer 'inspect', from Flemish scauwen 'to show'. The term originally denoted an officer who collected scavage, a toll on foreign merchants' goods offered for sale in a town, later a person who kept the streets clean
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