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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The material typically used for the pages was parchment, which is animal skin that's stretched and dried under tension, so it become s really flat and can be written on.