VOA慢速英语:美国宣布对俄罗斯实施新的经济制裁

hack –v. to secretly get into computer files or networks in order to get information or to cause damage

reckless –adj. not showing the correct concern about the possible bad results of actions

conversation –n. an informal talk involving two people or a small group; talking in an informal way

escalate –n. to make something worse or more severe