N a river boat with a shallow draught and a keel, used for freight and moved by towing, punting, or rowing 龙骨船
On centerboard sailboats, the centerboard functions like a keel to keep the boat from being blown sideways.
在使用活动龙骨的帆船上，活动龙骨的功能和固定龙骨一样，是防止船只被吹打得侧晃。
The keel of the boat which struck us came into the boat, on the right side. We could see the writing and details on the cargo ship.
这位工作人员还说，碰撞事故发生后客轮上的乘客可以看到撞到船上的货轮的龙骨。
All sailboats need a keel of board for this reason: the narrow, flat surface of the board or keel produces little drag when the boat moves forward but resists motion sideways.
所有的帆船都为了这个理由需要某种龙骨：狭窄平滑的龙骨表面对于帆船的前行几乎没有阻力，但却能很好抗拒侧移力。
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