VOA慢速英语:WHO: 80% of Urban Residents Breathe Unsafe Air

urban – adj. of or relating to cities and the people who live in them

stroke – n. a serious illness caused when a blood vessel in your brain suddenly breaks or is blocked

premature – adj. happening too soon or earlier than usual

colleague – n. a person who works with you : a fellow worker

monitor – v. to watch, observe, listen to, or check (something) for a special purpose over a period of time

renewable – adj. able to be extended for another time period : able to be renewed : restored or replaced by natural processes : able to be replaced by nature

sustainable – adj. able to be used without being completely used up or destroyed : involving methods that do not completely use up or destroy natural resources : able to last or continue for a long time

rapid – adj. moving quickly