They can also be made of plastic, animal bone or metal.

它们也可以由塑料、动物骨头或金属制成。

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Doctors have replaced the top of his hip bone with a metal sphere.

医生用一个金属球体置换了他的股骨头。

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Doctors have replaced the top of his hip bone with a metal sphere.

医生用一个金属球体置换了他的股骨头。

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