... bark of official magnolia 厚朴 bark of paper mulberry 构树皮 bark of pomegranate 石榴皮 21世纪 教育网 ...
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The most popular material is the inner bark of the paper mulberry tree.
最流行的材料是纸桑的内层书皮。
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The first paper seemed to have been made from mulberry bark, rag, flax and, later on, bamboo was used in the early days of papermaking.
第一张纸是从用桑树树皮，破布，亚麻，后来，初期造纸用的是竹子。
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