a.[Z][B]

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

   她把演说的要点记了下来。

2. 尽力的，全力的

n.

1. （自来水，煤气等的）总管道[C]
   Water is supplied from the mains.

   水的供应来自总水管。

2. （电，铁路等的）干线[C]
3. 体力；力量[U]
4. 主要部分；要点[the S]
   She devoted the main of the second chapter to the political system of the country.

   她在第二章里主要讨论了该国的政治体制。

   His ideas are, in the main, impractical.

   他的主意大体说来很不实际。

5. 大陆
6. 【书】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.