stratosphere

例句：

1. 1. Thestratosphere is the layer of theatmosphere above the troposphere.
   平流层是大气层中位于对流层之上的一层。
2. 2. Thestratosphere is aregion where weather patterns are formed.
   平流层是形成天气模式的区域。
3. 3. The stratosphere is an importantsource of ozone in the Earth's atmosphere.
   平流层是地球大气中臭氧的重要来源。