VOA慢速英语:中美让研究人员的旅行更加困难

anecdotal – adj. based on unscientific reports or observations

tit-for-tat – n. a situation in which you do something to harm someone who has done something harmful to you

depoliticize - v. to change (something) so that it is no longer influenced or controlled by politics

unfettered – adj. to loosen up; to free or release

enhance – v. to build up or improve

intellectual property - n. something (such as an idea, invention, or process) that comes from a person's mind

implement - v. to begin to do or use something, such as a plan