必需: essential; indispensable; vitally need 短语和例子发展工业所必需的原料 raw materials essential for industrial development; 用在最必需的地方 be used where it is most needed; 这些参考书是我们所必需的。 these reference books are
The body can make only 13 of the amino acids - - these are known as the nonessential amino acids 身体能只有13氨基酸-这些被称为非必需氨基酸。
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The amount of necessary amino acid ( e % ) is all 40 % above . it is between 0 . 85 - 1 in the ratio of necessary to unnecessary amino acid ( e / n ) which exceed perfect protein mode 必需氯基酸的总量( e )均高于40 ;必需氨基酸与非必需氨基酸的比值( e n )处于0 . 85 1之间,均大于优质蛋白模式。