upper air

• 高层空气,高空

upper air的用法和样例：

例句

1. Currents of warm air keep the hang-gliders aloft.
   悬挂式滑翔机借着暖气流在高空飞行。
2. Request upper wind at dumping altitude.
   请告诉放油高度上的高空风。
3. Particle concentrations in the upper atmosphere drop regularly as the altitude rises.
   在高层大气中粒子浓度随高度的增加而有规律地下降。
4. The upper layer of the atmosphere is referred to as the heterosphere because it has several layers of different gases.
   高层大气包括气体成分不同的几个层，所以也叫非均质层。