noun · The keel-shaped sternum of a bird, where the powerful flight muscles are attached.

这种鸟的龙骨突非常大，显示出其强大的飞行能力。

noun · Fossilized animal bones or teeth used in Traditional Chinese Medicine for their supposed sedative properties.

中医师在药方中加入了龙骨以助安神。

noun · The primary structural member of a ship, running along the centerline of the hull's bottom.

造船工人首先铺设了这艘远洋货轮的龙骨。