ultralight

ultralight ultralight down ultralight down aircraft 与 plane 有什么区别?主要是用在什么场合?经常看到的都是使用 aircraft 这个词儿,很少见到 plane.Ultralight AircraftSport Aircraft 请教一个英语句子的语法结构just as any aircraft, from an ultralight to a jumbo jet, must abide by the laws of aerodynamics, so must a lasting society achieve ecological harmony我主要是 so must a lasting society achieve ecological ha