VOA慢速英语:科学家在废水中发现了大量贵金属

clog – v. to slowly form a block in (something, such as a pipe or street) so that things cannot move through quickly or easily

diaper – n. a piece of cloth or other material that is placed between a baby's legs and fastened around the waist to hold body waste

grease – n. an oily substance

trace – n. a very small amount of something

effluent – n. liquid (such as sewage or industrial chemicals) that is released as waste

sludge – n. a soft, thick material that is produced in various industrial processes (such as in the treatment of sewage)

toilet – n. a large bowl attached to a pipe that is used for getting rid of bodily waste and then flushed with water

unfortunately – adv. used to say that something bad or unlucky has happened