主中桅

例句：

1. 1. The main mast is the tallest part of the ship.
   主桅是船的最高部分。
2. 2. The main mast is where the sails are attached.
   主桅是挂帆的地方。
3. 3. The main mast is used to support the weight of the ship.
   主桅用来支撑船的重量。