翼龙的每个前肢都有一根长长的第四指，支撑着像翅膀一样的膜。

In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing-like membrane.

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这意味着它能像一架直升机那样作空中悬停，而在向前飞行时，又能降低主旋翼的速度，因为它的一对短翼提供了部分升力。

This means it can hover like a helicopter, but when flying forward can reduce the speed of the main rotor because the wings provide part of the lift.

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这意味着它能像直升机一样悬停，但向前飞时可能减少主旋翼的速度并让这两个短翼提供部分提升力。

This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift.

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