Because of the limited gliding distance on the deck, carriers have to use catapults to help warplanes fly into air.因为甲板上滑行的距离有限，航空母舰必须使用弹射器将飞机弹入空中。On that type of aircraft carrier, a catapult was used to help launch aircraft.那种航空母舰利用弹射器弹射飞机升空。The aircraft are launched by catapult.飞机借助弹射器起飞。