他还设计过带有旋转翼的飞行器模型，与今天的直升机很相似。

He also designed the prototype for a flying machine with a rotating wing similar to today's helicopters.

youdao

他还设计过带有旋转翼的飞行器模型，与今天的直升机很相似。

He also designed the prototype for a flying machine with a rotating wing similar to today's helicopters.

youdao