butynoic acid

例句：

1. 1.Butyric acid is a natural substance found in the human body.
   丁酸是一种存在于人体中的天然物质。
2. 2. The butyric acid in this product helps to improve digestion.
   该产品中的丁酸有助于改善消化。
3. 3.Butyric acid can be produced by bacteria in the gut.
   肠道中的细菌可以产生丁酸。