VOA慢速英语:比尔·盖茨谈厕所的未来

feces - n. solid waste that is released from the body

parasitic - adj. living in or on another animal or plant

toilet - n. a large bowl attached to a pipe that is used for getting rid of body waste

sewer - n. an underground pipe that is used to carry off water and sewage

sanitation - n. the process of keeping places free from dirt, infection, disease, etc.. by removing waste, trash and garbage