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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Bambo's the most common material, but they are also made of various types of wood, as well as plastic, porcelain, and animal bone.

竹子是最常见的材料，但它们也可以用各种各样的木材、塑料、瓷器、动物的骨头做成。

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Bamboo's the most common material, but they are also be made of various types of wood, as well as plastic, porcelain, animal bone, ivory, metal, coral, agate, and jade.

竹子是最常见的材料，但它们也可以用各种各样的木材，以及塑料，瓷器，动物的骨头，象牙，金属，珊瑚，玛瑙，玉器等做成。

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Macchiarini performed the nine-hour operation on April 9 at the Children's Hospital of Illinois after carefully creating the windpipe using stem cells from Hannah's bone marrow that were saturated over a matrix of plastic fibers shaped into a tube.

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