The people cultivate mainly rice and beans.

　　這里的人們主要種植稻子和豆類。

　　Police work is mainly routine.

　　警察的'工作主要都是按常規(guī)的。

　　The tanks were mainly constructed of steel plates.

　　這些坦克車主要是用鋼板制造的。

　　The day should be mainly dry with sunny intervals.

　　白天大部分時間應無雨，間有陽光。

　　The target audience for this advertisement was mainly teenagers.

　　這個廣告的對象主要是十幾歲的青少年觀眾。