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1.accretion n.增长( the process of growth or enlargement by a gradual build-up)；增加物( added matter or thing formed by the addition of such matter) 词根记忆：ac+cret(增加)+ion一增长 例:accretion disks吸积盘//This continuous process of accretion and succession would be interrupted only by hurricanes or storm flushings. 2.accrue v.自然增长，自然产生( to come about as a natural growth,increase, or advantage) 词根记忆：ac+crue(增加)--自然增长，自然产生 例:The benefits would accrue to the individual, while the costs would be spread among all users. 派生词:accrual(n.获利：自然增长) 3.accumulate v.积累( to gather or pile up)；堆积(to amass) 词根记忆：ac（不断）+cumul（堆积）+ate(使)一使不断堆积起来一积累 例:Recyclable trash that is allowed to accumulate for two weeks will attract rodents(啮齿动物)． 派生词:accumulation(n.集聚;积累) 4.accuracy n.准确（性），精确（性）( exactness) 词根记忆：ac(加强)+cur(注意)+acy(表性质)一十分注意一准确 例:The accrnacy of animals memories is difficult to determine through direct experimentation. 派生词:inaccuracy(n.误差，错误) 5.accurate a.正确的( correct)：精确的(exact) 例:Sailors needed highly accurate timepieces in order to compute their longitude. | 
