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