I wanted to have a horizontal level, a vertical level, and a circular level.

我想有一个横向的水平，垂直的水平，和一个圆形的水平。

youdao

The easier level of the challenge requires flights of 90 seconds and a landing on a small, flat circular pad.

稍容易的初级挑战级别要求飞行90秒，然后在一个小型圆形平台上降落。

youdao

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.

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。

youdao

The topmost section features a physical volume dial that also serves as a mute switch when pushed, surrounded by a circular cluster of LEDs (for clockwise-flowing level indication) and then a secondary outer ring of capacitive buttons and LED indicators.

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