您要查找的是不是：
- 13-顺维A酸13-cis-retinoic acid
- 9-顺维A酸all-tran retinoic acid
- 13-cis-维A酸13-c/s-retinoic acid
- 半胱氨酸cysteine
- 氨酸amino acid
- 把A误以为take A for B
- 丙酮酸pyruvic acid
- 把A视为looked upon A as B
- 丙酸monoprop
- 苯丙氨酸phenyl alanine
- 把A比喻compare A to B
- 丙氨酸lactamine
- 把A换成exchange A for B
- 没食子酸gallic acid
- 我得了一个A-。I got an A minus.
- 把A误认为mistake A for B
- 阿魏酸ferulic acid
- 这些苹果有点酸。These apples are a bit tart.
- 马来酸maleic acid
- 植酸phytic acid
