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氨基酸 — amino acid (English)
Organic compounds containing a carboxyl group (-COOH) and an amino group (-NH2). About 30 amino acids are known. They are fundamental constituents of living matter because protein molecules are made up of many amino acid molecules combined together. Amino acids are synthesized by green plants and some bacteria, but some (arginine, histidine, lysine. threonine, methionine, isoleucine, leucine, valine, phenylalanine, tryptophane) cannot be synthesized by animals and therefore are essential constituents of their diet. Proteins from specific plants may lack certain amino acids, so a vegetarian diet must include a wide range of plant products. (Source: ALL)

The original Chinese definition:

氨基酸 (Chinese)
包含一羧基(-COOH)和一氨基(-NH2)的有机化合物。约有30个已知的氨基酸。因为蛋白质分子就是由许多氨基酸分子组合形成的,所以它们是生物的最基本组成部分。氨基酸是由绿色植物和某些细菌合成,但(氨基胍基戊酸、组氨酸、赖氨酸、苏氨酸、蛋氨酸、异白氨酸、白氨酸、缬氨酸、氨基苯基丙酸、色氨酸)无法由动物合成因此是它们的饮食要素。某些植物的蛋白质可能缺乏某些氨基酸,因此一素食习惯须包括广大范围的植物食品。

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