calculate [同]compute, estimate
v. to work（sth.）out by using numbers or one's judgment; estimate计算；推算
It has been calculated that the world's population will double by 2050. 据推算，世界人口在2050年将要增加一倍。
naive [同]innocent, simple
adj. lacking experience of life, knowledge or good judgement and willing to believe that people always tell you the truth缺乏经验的；幼稚无知的；轻信的
to be politically naive对政治一无所知
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