To enter, she needed a special key made from a chicken bone, which she did not have.

为了进去，她需要一把用鸡骨头做的特殊钥匙，但她没有。

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Yale is well known for its secret societies, the most famous of which are the Skull and Bone Society, which boasts members such as George W. Bush and John Kerry, and the Scroll and Key Society.

耶鲁还以秘密社团闻名，最有名的是骷髅社团——有引以为荣的成员如乔治·布什和约翰·克里——以及轴匙社团。

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Periodontitis is an infectious diseases and the key feature is bone resorption, but the exact mechanism of etiology is unclear.

牙周炎是一类以牙槽骨吸收为主要特征的感染性疾病，但其病因理论中的许多具体机制尚未明了。

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Meanwhile, some signaling fats from the same family work like hormones to build bone mass, a key to treating osteoporosis.

FORBES: Magazine Article

But Wall Street analyst are skittish about what will happen, especially after the unrelated delay of a key experimental bone drug.

FORBES: Merck To Pay $688 Million To Shareholders For Delaying Vytorin Results

And of course vitamin D is key to building bone health and preventing osteoporosis.

FORBES: That Vitamin D You're Taking? It May Not Be What It Appears