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例：Ratings of productivity correlated highly with ratings of both accuracy and attendance. //Managers responded that productivity was the critical factor in assigning ratings.
词根记忆：rat(计算)+io--和计算有关的--比例
例：Statistics show that the ratio of women's earnings with that of men have been roughly static since 1960.
词根记忆：rat(计算)+ion--计算着给--配给
例：a rationing mechanism配给机制
词根记忆：ration(理性，定量)+al--理性的，合理的
例：The majority of successful senior managers do not closely follow the classical rational model of first clarifying goals.
派生词：rationally( ad.理性地)
同根词：rationalistic(a．理性主义的；纯理论的)
词根记忆：rat(计算)+ion+ale--通过精密计算--根本性的依据
例：My professor disagreed with the rationale of my argument.
词根记忆：react(反应)+or--发生反应的东西--反应堆
例：nuclear reactor核反应堆
例：l Women accepted the more unattractive new industrial tasks more readily than did men.//Such foods are more readily available in China than in the U.S
联想记忆：real(真正的)+m--真正的好东西（如音乐，艺术）无国界--领域；国度
例：the realm of science科学领域
例：The identical twins were reared apart from each other.//rear wheel后轮
