VOA慢速英语:专家考虑结束朝鲜核活动的代价

positive – adj. good, useful

summit – n. a meeting between two or more leaders or heads of state

sustained – adj. providing what is needed for something carry on

strategic – adj. related to a general plan created to reach a larger goal, usually over a long period of time

verifiable – adj. something that can be proven as true

irreversible – adj. something that cannot be changed

concessions – n things that are given to reach an agreement

transferred – adj. to move something from one place to anouther