VOA慢速英语:特朗普宣布美国进入国家紧急状态

regulation –n. an official rule or law that states how something should be done

flexibility –n. the willingness or ability to change or try something new

detect –v. to discover or find something that is being looked for

quarantine –n. a situation in which a person or people are kept away from other to prevent a disease from spreading

epicenter –n. the place on the Earth's surface that is where something begins, like an earthquake or a disease outbreak