单词：upper air
upper air的用法和样例：
例句
- 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。
- Request upper wind at dumping altitude.请告诉放油高度上的高空风。
- 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。
- 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。
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