prey
preyprey[preɪ]'prey on sb (also 'prey upon sb more formal)1.■to treat sb who is weaker than you in an unfair or dishonest way in order to get sth or gain an advantage for yourself欺压，欺负﹙弱者﹚:The thieves have been preying on elderly people living alone.窃贼一直在偷独居老人的东西。[synonym]exploit sb2.■[NOTE]Prey on/upon sb can be used in the passive. prey on/upon sb 可用于被动语态。[G]v+prepprey on sb’s 'mind 3.■if a problem or a thoughtpreys on your mind, you think and worry about it all the time﹙问题或想法﹚萦绕心头；使耿耿于怀'prey on sth (also 'prey upon sth more formal)4.■if a bird or an animal preys on/upon another bird or animal, it hunts and kills it for food﹙鸟兽﹚捕食，猎获:They prey on small mammals.它们捕食小哺乳动物。5.■Prey on/upon sth can be used in the passive. prey on/upon sth 可用于被动语态:These small fish are preyed upon by sharks and other fish.这些小鱼是鲨鱼和其他鱼类的猎物。[G]v+prep
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