a crystalline amino acid found in proteins and occurring naturally in sugar beets and sugar cane
例句
用作名词 (n.)
For example, the amino acid phenylalanine, one of the key ingredients in the artificial sweetener aspartame, is sweet in one form but bitter in another. 例如，人造甜味剂天冬氨酰苯丙氨酸甲酯的重要成分之一苯丙氨酸，其一种异构体是甜的，而另一种却是苦的。
美
