the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)
parasitism详细解释
par.a.sit.ism n.（名词）The characteristic behavior or mode of existence of a parasite or parasitic population.寄生，寄生行为：寄生物或寄生种群存在时具有显著特征的行为或方式Parasitosis.寄生物病，寄生虫病
