Recently,I flew to Las Vegas to attend a meeting.As we were about to arrive,the pilot announced with apology that there would be a slight __21__要延误一点才能降落。 before setting down.为24题设伏。 High desert winds had __22__沙尘暴使得机场只留下一条跑道,其余跑道被迫关闭。 the airport to close all but one runway.He said that we would be __23__在城市上空盘旋。