1944年7月22日,一架美国军用运输机飞抵延安机场上空。飞机降落时并不顺利。在缓慢滑行时,飞机的左轮陷进了一座旧坟墓中,导致飞机转动着的左螺旋桨与地面相撞,螺旋桨折断。飞机上的乘客就是即将驻扎在延安的美军观察组。周恩来上前对观察组组长包瑞德上校说:“上校先生,一位英 On July 22, 1944, a U.S. military transport plane flew over Yan’an Airport. The plane did not go well when it landed. During a slow taxi, the aircraft’s left wheel was trapped in an old grave, causing the aircraft’s rotating left-hand propeller to collide with the ground and the propeller to break. The passengers on the plane were the U.S. military observer team to be stationed in Yan’an soon. Zhou Enlai approached Colonel Patricia, head of the observation team, and said: "Colonel, an Englishman