Airplanes retract their landing gear while in flight for the same reason.
出于同样的原因，飞机在飞行时收回起落架。
2
The five of us in our field party arrived with our sleep kits and personal gear several days after the last cargo flight, because of the weather delays from high winds in the previous week.
由于前一周大风天气造成的延误，我们现场勘察组5人带着睡袋及个人装备在最后一班货运航班几天后才抵达。
3
Because of the lack of hydraulics, we are not sure our landing gear will lock, so the flight attendants will prepare you for a bumpy landing.