bacteria utilize the tryptophan

例句：

1. 1.Bacteria are tiny organisms that live in the soil and water.
   细菌是生活在土壤和水中的微小生物。
2. 2.The bacteria in the soup may have caused the food poisoning.
   汤里的细菌可能引起了食物中毒。
3. 3. Researchers are studying how bacteria can be used to treat cancer.
   研究人员正在研究如何利用细菌治疗癌症。