VOA慢速英语:伊朗击落美国无人机 特朗普称之为“大错误”

uNPRovoked - adj. not caused by anything said or done

surveillance - n. the act of carefully watching someone or something especially in order to prevent or detect a crime

desalinate - n. to remove salt from

miscalculation - n. to make an error in judging a situation