excretion of bile

例句：

1. 1. The doghas a habit of defecating inthe house.
   这只狗有在屋里拉屎的习惯。
2. 2. The scientist conducted an experiment tostudy the elimination process of urine.
   科学家进行了一项实验，研究尿液的排泄过程。
3. 3. Thewastewater from the factoryneeds to be properly treated beforebeing released into the environment.
   工厂产生的废水需要经过适当处理后才能排放到环境中。