scavenger [ˈskævəndʒɚ]

例句:

• The condor is primarily a scavenger, feeding on carrion.
  来自BBC
• The brown rat...is an omnivorous scavenger.
  来自Natural World
• He's just fit for a job as scavenger.
  他只配当个清道夫.
  
• He is not a scavenger nor just a moving appetite as some sharks are.
  它不是食腐动物,也不像有些鲨鱼那样,只知道游来游去满足食欲.
  
• Mulberry red pigment hence was a good kind of natural radical scavenger.
  桑椹红色素是一种很好的天然自由基清除剂.
  
• Couldn't you see Kickball-Math, or Obstacle Course-Scavenger Hunts?
  来自SA