He shot at the police officer and the police officer returned his fire. 他向警察开枪，警察开枪还击。The demonstrators attacked and burned buildings and cars; the soldiers responded by opening fire.示威者冲击并焚烧建筑物和汽车，士兵开枪还击。The guards returned fire, and the ensuing gunfight lasted all day.卫兵们开枪还击，接下来发生的枪战持续了一整天。