我的飞行机器既没有翅膀也没有螺旋桨，您可能会看到它在地上，和你绝不会猜到它是一架飞行机器。
My flying machine will have neither wings nor propellers. You might see it on the ground and you would never guess that it was a flying machine.
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?
他没有在飞行过程中看到火或烟，他认为螺旋桨在旋转。
He saw no fire or smoke during the flight and he believed both propellers were rotating.
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