rake of keel

例句：

1. 1. The keel of the ship is made of steel.
   这艘船的龙骨是用钢制成的。
2. 2. The stern of the boat is decorated with a beautiful design.
   船尾装饰着美丽的设计。
3. 3. The keel of the ship is strong and durable.
   这艘船的龙骨很坚固耐用。