VOA慢速英语:朝韩两国领导人达成消除核武器目标

transitional – adj. of or involving change

phase – n. a step in a process; a short period of time

thoroughly – adj. completely; exactly

implement – v. to carry out

adopt – v. to take up; to officially accept and put into effect

impact – n. a major or powerful effect

zone – n. area

ballistic – adj. relating to or involving the science of moving objects in flight

crucial – adj. important

sanction - n. a measure designed to punish a country for failure to obey international laws or rules