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silkworm cocoon
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silkworm cocoon
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工学
蚕茧
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silkworm cocoon
蚕茧
蚕儿老熟后,蚕体内绢丝腺中绢丝液从吐丝口吐出,在空气中经牵引凝固悬于蔟具上的囊形结构物。
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