副詞 in the main:

1. for the most part
   同義詞：chiefly, principally, primarily, mainly
2. without distinction of one from others
   同義詞：generally, in general

1. The whole school (was) assembled in the main hall.
   全校在大禮堂集合。
2. These businessmen are in the main honest.
   這些商人大都很誠實。
3. The meetings are on Tuesdays and Thursdays in the main hall.
   會議在星期二和星期四於大禮堂舉行。
4. Put this letter in the main file.
   把這封信放在主要文件夾中。
5. The result be, in the main, satisfactory.
   結(jié)果基本上是令人滿意的。