ADV
主要地；大多数地
You use mainly when you are referring to a group and stating something that is true of most of it.
例句
The African half of the audience was mainly from Senegal or Mali...
观众中有一半是非洲人，其中大多数来自塞内加尔或马里。
The spacious main bedroom is mainly blue.
宽敞的主卧室以蓝色为主色调。