In the 1960s and 1970s, most personal and corporate planes were propeller or turbo-prop aircraft, which fly at a lower altitude than jetliners.
在1960和1970年代，大部分个人和企业的飞机是飞行高度低于喷气式飞机的螺旋桨式或涡轮螺旋桨式飞机。
It has timed its push to take advantage of regional airlines' desire to replace traditional, noisy turbo-prop aircraft with sleeker, faster small jets.
正逢其时，正好可赶上区域航空公司需要以时尚的，更快的小型客机替换传统高噪音涡轮螺旋桨飞机。
So can other aircraft, such as helicopters or prop-planes that don't have jet engines, fly through these conditions?
那么其他的一些飞行器，比如说直升飞机，螺旋桨飞机，他们没有喷气式引擎，可以在这种条件下飞行吗？
The turbo-prop, high-wing, versatile “Herc” has accumulated over 20 million flight hours. It is the preferred transport aircraft for many US Government services and over 60 foreign countries.
它采用的四发涡轮增压发动机、高单翼和尾部大型货仓设计使其已经累积飞行时间已经超过2000万小时，是美国和超过60个国家的首选运输机。
The westland wyvern was the last fixed - wing aircraft design from the westland aircraft co . and was one of the last prop - driven fighters.
“飞”攻击机是威斯特兰公司设计的最后一种固定翼飞机，是一种末代的螺旋桨战斗机。
The westland wyvern was the last fixed - wing aircraft design from the westland aircraft co . and was one of the last prop - driven fighters.
“飞”攻击机是威斯特兰公司设计的最后一种固定翼飞机，是一种末代的螺旋桨战斗机。
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