main/meɪn/

a. larger or more important than others of the same kind

a. [仅置于名词前] 主要的：The main problem is lack of money. 最重要的问题是缺少钱。

◇Our main aim this month is to enlarge our vocabulary. 我们这个月的主要目标是扩大词汇量。

音组-ain/-eɪn/

again; brain; chain; gain; grain; main; pain; plain; rain; train

辨析chief; main; major