upper air的用法和樣例：
例句
- Currents of warm air keep the hang-gliders aloft.
懸挂式滑翔機借著暖氣流在高空飛行。 - Request upper wind at dumping altitude.
請告訴放油高度上的高空風。 - Particle concentrations in the upper atmosphere drop regularly as the altitude rises.
在高層大氣中粒子濃度隨高度的增加而有規律地下降。 - The upper layer of the atmosphere is referred to as the heterosphere because it has several layers of different gases.
高層大氣包括氣體成分不同的幾個層，所以也叫非均質層。
