同根派生 bilge keel相关词英汉例句The keel of the boat was made of steel.这船的龙骨是钢制的。The keel of her sister ship will be laid by the time she discharges at Calcutta.等它在加尔各答卸货的时候,它的姊妹船的龙骨就会铺好啦。bilge keel更多例句