地球是一个奇迹环境｜美国将国家地理中文网设为星标方能收到正常推送在北达科他州芒特赖尔县(Mountrail County, North Dakota)的巴肯油田(Bakken Oil ...

LOS ANGELES, June 21 (Xinhua) -- North Dakota Governor Kelly Armstrong declared a statewide disaster on Saturday after three people were killed in a violent tornado that tore through the Upper Midwest ...