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1.behavioral a.行为的( of or relating to behavior) 来自behavior(n．行为举止) 例:Geneticists consider the gene to be a behavioral gene. 派生词：behaviourism(n.行为主义) 2.bellows n．风箱(apparatus for driving air into or through sth.) 词根记忆：和bellow(v.吼叫)一起记 3.benchmark n.基准(something that serves as a standard by which others may be measured or judged)；v.标准测试(to study, as a competitors product or business practices, in order to improve the performance of ones own company) 联想记忆：bench（法官席，引申为法律）+mark(记号)一将法律作为我们的基准 例:The technique to judge the performance of a company by comparing it with other companies is called“benchmarking. 4.benefactor n.行善者，捐助者(one that confers a benefit) 词根记忆：bene(好)+fact(做)+or--做好事的人--行善者 例:Since private institutions had also lost benefactors, they began to charge patients. 同根词：benevolent(a．慈善的) 5.beneficiary n．受益人，受惠者(one that benefits from sth.) 词根记忆：来自benefit(n.利益) 例:Moreover, part of this remaining third is received by workers who are shareholders, pension beneficiaries, and the like. 同根词：beneficial(a．受益的，有利的) | 
