飞机 airplane; plane; aeroplane; kite; bird; aircraft 不明国籍的飞机 unidentified aircraft; 垂直降落飞机 vertical takeoff and landing aircraft (vtol); 短距起落飞机 short takeoff and landing aircraft (stol); 螺旋桨飞机 propeller-driven plane; 水上飞机 hydroplaner; marine aircraft; seaplane; 直升飞机 helicopter; copter; 水空两用飞机 amphibious plane; 喷气飞机 jet plane; 无人驾驶飞机 robot plane; 双引擎飞机 twin-motored plane; 双座飞机 two-seater plane; 乘飞机旅行 travel by air [plane]; 给飞机加油 fuel a plane; 飞机失去控制被迫降落在湖面上。 the plane lost its control and was ditched on the lake. 坐飞机去美国要花多少钱? how much does it cost to fly to the united states
But they also have to be able to earn the money they need to invest in new aircraft , because younger fleets are more efficient 但航空公司同样要必须能赚到它们用来投资购买新飞机所需的钱,因为飞机队越年轻就越有效率。