名词
中文翻译：初级链
同义词：
['primary link', 'primary structure']
例句：
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1. The primary chain in theDNA is responsible for encoding genetic information.
DNA中的初级链负责编码遗传信息。
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2. Theprimary chain of a protein is its aminoacid sequence.
蛋白质的初级链是其氨基酸序列。
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3. The primary chain of the proteinwas found to be made up of severaldifferent amino acids.
蛋白质的初级链被发现由几种不同的氨基酸组成。