VOA慢速英语:美国官员对硅谷欢迎中国投资有所保留

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

artificial intelligence –n.ability of a machine to reproduce human behavior

pose – v.to be or create a possible threat, danger or problem

vagueness – n.in a way that is not clearly stated or expressed

startup – n.a new company

innovation – n.the act of creating new ideas, systems or products