VOA慢速英语:美国承诺朝鲜核协议后的经济投资

verifiable – adj. to prove, show, find out, or state that (something) is true or correct

irreversible – adj. not able to be changed back

in spades – n. large amounts

grid – n. a system of electrical wires and equipment that supplies electricity

infrastructure - n. roads, public water supplies and other public services

gesture – n. something said or done to show a feeling

ballistic – adj. related to a flying object or its flight