The U.S. military went on full alert.Two aircraft carriers left the Naval base in Norfolk, Virginia, in response to the attacks to provide upgraded air defense for New York and Washington.是什么意思_The U.S. military went on full alert.Two aircraft carriers left the Naval base in Norfolk, Virginia, in response to the attacks to provide upgraded air defense for New York and Washington.在线翻译_英语_读音_用法_例句