n.飞行云，轨迹，凝结尾（飞机在晴冷而潮湿的空气中飞行时在尾部所形成的一条类似云带物）； 英英释义： contrail[ 'kɔntreil ]n.an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust同义词：cond