您要查找的是不是：
- 托可维A酸Tretinoin Tocoferil
- 阿维A酸acitretin
- 芳维A酸all-trans-aritinoic acid
- 维A酸霜Retinoids
- 酸化acidification
- 不仅A而且not merely A but also B
- 羧酸carboxylic acid
- 与其说A不如说not so much A as B
- 半胱氨酸cysteine
- 酸洗acid cleaning
- A股A-share
- 甘氨酸glycine
- 把A误以为take A for B
- 赖氨酸lysine
- 氨酸amino acid
- 精氨酸arginine (Arg)
- 色氨酸tryptophan
- 核苷酸ribonucleotide
- 丙酮酸pyruvic acid
- 磺酸sulfoacid
