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The third is how to enrich color species of colorful cocoon silk.
第三是彩色茧色彩种类如何丰富的问题。
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A cocoon is a kind of silk covering made by an insect.
蚕茧是由昆虫制造的一种由丝组成的外包层。
youdao
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A cocoon is a kind of silk covering made by an insect.
蚕茧是由昆虫制造的一种由丝组成的外包层。
youdao