酸基

例句：

1. 1. The vinegar in the recipe is essential for the dish's flavor.
   食谱中的醋对这道菜的风味至关重要。
2. 2. The chemical reaction between acids and bases is what gives fruits their distinctive flavors.
   酸和碱之间的化学反应赋予了水果独特的口味。
3. 3. Acids are often used to precipitate proteins from solutions.
   酸常用于从溶液中沉淀蛋白质。