| 单词 | 氮平衡 |
| 释义 | 〔phenylalanine〕An essential amino acid, C6H 5CH 2CH(NH 2)COOH, that occurs as a constituent of many proteins and is normally converted to tyrosine in the human body. It is necessary for growth in infants and for nitrogen equilibrium in adults. 苯丙氨酸：一种基本的氨基酸，C6H 5CH 2CH(NH 2)COOH，是许多蛋白质的组成成分，通常在人体内常转变为酪氨酸。它是婴儿成长和成人的氮平衡所必需的 〔leucine〕An essential amino acid, C4H 9CH(NH 2)COOH, derived from the hydrolysis of protein by pancreatic enzymes during digestion and necessary for optimal growth in infants and children and for the maintenance of nitrogen balance in adults. 亮氨酸：一种重要的氨基酸，C4H 9CH(NH 2)COOH，由胰酶在消化过程中从蛋白质的水解作用中分离出来，对婴幼儿良好的生长发育及成人保持氮平衡十分必要 |
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