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。

In the 1960s and 1970s, most personal and corporate planes were propeller or turbo-prop aircraft, which fly at a lower altitude than jetliners.

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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？

So can other aircraft, such as helicopters or prop-planes that don't have jet engines, fly through these conditions?

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俱乐部的墙上满是波兰飞行员的黑白相片，还有一个喷火式战斗机的巨大螺旋桨悬挂在一面墙上。

The walls of the club were covered with black-and-white photos of Polish pilots, and a huge propeller from a Spitfire was fixed to one wall.

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