VOA慢速英语:Deadly Bombing on St. Petersburg Subway

subway - n. a train that operates mostly underground

tracks - n. a pair of metal bars that a train, trolley, or subway car rides along

suspect - n. a person believed by police to be involved with a crime

condolence - n. expressions of sympathy for the death of a relative or loved one

escalator - n. a moving set of stairs that carries people up or down from one level of a building or station to another

resort - n. a place where people go for vacations