它们也可以由塑料、动物骨头或金属制成。
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。
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.
在动物研究中，癌仅与持续或反复暴露于金属致癌物有关联。
In animal studies cancer has only been associated with metal carcinogens involving continual or repeated exposure.
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