Amino acids contain both acids(carboxylic acids)and bases(amino group), so they react sith both acids and bases.
Amino acids contain both acids(carboxylic acids)and bases(amino group), so they react sith both acids and bases.
氨基酸包含酸（羧酸）和碱（氨基团）所以它既可以与酸反应也可以和碱反应。