突发！美国至少十八个州进入紧急状态

Group 1 - The winter storm sweeping across the United States has led to at least 18 states declaring a state of emergency, affecting approximately 170 million people under extreme weather alerts [1] - Over 13,000 flights have been canceled due to the storm, marking the most severe disruption in air travel since the government shutdown last year [1] - The storm's impact is expected to cover over 3,000 kilometers across the U.S., potentially being one of the largest winter storms in years [1] Group 2 - The National Weather Service has warned that the storm may cause icy roads and travel difficulties, with heavy snowfall and strong winds significantly reducing visibility [2] - Federal government offices in Washington, D.C. will close on January 26, and several universities have announced class cancellations [2] - The Department of Homeland Security has stated that the Federal Emergency Management Agency is prepared to provide support to affected areas [3]