在限定的时间内，参赛队伍必须让他们的飞行器垂直起飞，成功地控制飞行和降落，然后返回。

Against a tight timeline, the teams must prepare their vehicles to make vertical take-offs, controlled flights and successful landings-and then hop back home again.

youdao

环翼机没有尾翼，而是采用一个延伸的圆形作为外部引擎，帮助飞机完成水平飞行和垂直起飞降落。

Instead of using wings, the coleopter employed a circular extension serving as the outer part of the jet engine while helping the aircraft achieve level flight, as well as vertical ascent and landing.

youdao

环翼机没有尾翼，而是采用一个延伸的圆形作为外部引擎，帮助飞机完成水平飞行和垂直起飞降落。

Instead of using wings, the coleopter employed a circular extension serving as the outer part of the jet engine while helping the aircraft achieve level flight, as well as vertical ascent and landing.

youdao