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蛋白质是复杂的大分子，由一条或几条多肽链组成。
Proteins are complex macromolecules made up of one of more polypeptide chains.
youdao
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蛋白质是由一条或多条多肽链组成。
Proteins are made up of one or more polypeptides.
youdao
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蛋白质是由一条或多条多肽链组成。
Proteins are made up of one or more polypeptides.
youdao