The keel of the boat was made of steel.
这船得龙骨是钢制得。
WW realized that the boat had lost its keel.
我们发现船的龙骨掉了。
The depth of a boat in the water, measured from the waterline to the lowest section of the keel.
帆船进入水的深度，从水平面到龙骨最低处测量。
The keel helps the boat resist the leeward force of the wind and provides stability against excessive heeling.
龙骨帮助船只抵御背风力，并稳定过度倾侧。
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