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自今年5月22日中美双方签署新的扩大两国航空运输市场准入协议以来,美国已有5家航空公司同时向美国运输部提出开辟新的中美航
Since the two sides signed a new agreement on market access for expanding air transport between China and the United States on May 22, five U.S. airlines have also proposed to the U.S. Department of Transportation to open up a new China-US airlines