VOA慢速英语:美国限制一些中国签证

aviation - n. the business or practice of flying airplanes, helicopters, etc.

classified - adj. kept secret from all but a few people in the government

consular - n. a government official whose job is to live in a foreign country and protect and help the citizens of his or her own country who are traveling, living, or doing business there

dominance - n. more important, powerful, or successful than most or all others

harsh - adj. unpleasant and difficult to accept or experience

impose - v. to cause (something, such as a tax, fine, rule, or punishment) to affect someone or something by using your authority

institution - n. an established organization

legitimate - adj. allowed according to rules or laws

screen - n. the usually flat part of a television or computer monitor that shows the images or text

tariff - n. a tax on goods coming into or leaving a country

uNPRecedented - adj. not done or experienced before