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.
在短时期内，能留下考古记录的东西也都会退化为石头、骨头、玻璃、金属和陶器的碎片。
In a relatively brief period the archaeological record is reduced to mere scraps of stone, bone, glass, metal, and earthenware.
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