It can follow you, flying or staying in mid-air.
它可以在你的指挥下，飞行或停留在半空中。
The cheapest option could be to use giant mid-air refuelling aircraft, such as the US air force's KC-10 Extender, filled with sulphur dioxide or hydrogen sulphide gas.
最便宜的方案是使用巨型空中加油飞机——例如美国空军的KC-10“补充者”空中加油机（KC-10Extender），装满二氧化硫和硫化氢气体。
And such raising is not from mid-air, or behind closed doors, but is actually based on popularization.
而这种提高，不是从空中提高，不是关门提高，而是在普及基础上的提高。
A common example is using mid-air physical gestures to scroll, close Windows or switch between computer applications.
一个常见的例子是利用空气中的物理手势滚动、关闭窗户或在计算机应用程序之间切换。
A common example is using mid-air physical gestures to scroll, close Windows or switch between computer applications.
一个常见的例子是利用空气中的物理手势滚动、关闭窗户或在计算机应用程序之间切换。
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