a.[Z][B]

1. 主要的，最重要的
   She noted down the main points of the speech.

   她把演說的要點記了下來。

2. 盡力的，全力的

n.

1. （自來水，瓦斯等的）總管道[C]
   Water is supplied from the mains.

   水的供應來自總水管。

2. （電，鐵路等的）幹線[C]
3. 體力；力量[U]
4. 主要部分；要點[the S]
   She devoted the main of the second chapter to the political system of the country.

   她在第二章裡主要討論了該國的政治體制。

   His ideas are, in the main, impractical.

   他的主意大體說來很不實際。

5. 大陸
6. 【書】大海，海洋[the S]

adj.

n.

1. a principal pipe carrying water or gas or a cable carrying electricity.
   ▸ (the mains) Brit. the source of public water, gas, or electricity supply through pipes or cables.
2. (the main) archaic or literary the open ocean.
3. Nautical  short for mainsail or mainmast.

n.

1. (in the game of hazard) a number (5, 6, 7, 8, or 9) called by a player before dice are thrown.
2. historical a match between fighting cocks.