urea cycle的用法和样例：
例句
- It is based upon a naturally occurring enzyme called urease that essentially reverses the urea cycle by breaking down urea into metabolites that include ammonia and hydroxyl ions.
它是根据自然产生的尿素酶，基本上扭转了尿素循环打破尿素成氨的代谢物，包括羟基离子。 - Aspartic acid can be broken down in the KREBS CYCLE.
在三羧酸循环中天冬氨酸可以被分解。 - In the DREBS CYCLE it combines with pyruvic acid, leading to loss of carbon dioxide.
在三羧酸循环中，它可以和丙酮酸结合，导致二氧化碳的损失。
