The acrobat amazed the audience with his mid-air somersault.

杂技演员用他的空中翻筋斗让观众惊叹。

The magician hovers a card in mid-air to amaze the audience.

魔术师在空中悬停一张牌，令观众惊叹。

It can follow you, flying or staying in mid-air.

它可以跟随你，飞行或停留在半空中。

Her hand stopped in mid air.

她的手停在了半空中.

A balloon was suspended in mid air.

一个气球悬浮在半空中.

Is it really suspended in mid air?

那它真的悬在半空吗？

There was a balloon suspended in mid-air.

有一个气球悬在空中。

And off a blossom in mid air stands still.

又冲过中间空气中的一朵花,停下来.

And there they go again... swimming in mid-air.

他们又失重了…空中游泳。

So it is very necessary to study mid-air collision.

因此，对空中飞行碰撞风险问题进行研究是非常必要的。