船辐

例句：

1. 1. The ship's keel is the main support structure of the ship.
   船的龙骨是船的主要支撑结构。
2. 2. The wooden keel is the main support structure of the boat.
   木制的龙骨是船的主要支撑结构。
3. 3. The ship's keel is the main support structure of the ship.
   船的龙骨是船的主要支撑结构。