zonal structure

例句：

1. 1. The zonal wind is blowing from the northwest.
   纬向风正在从西北方向吹来。
2. 2.The zonal circulation is responsible for the global climate system.
   纬向循环对全球气候系统负责。
3. 3. The zonal variation in temperature can be observed in different regions of the world.
   不同地区的温度变化可以观察到纬向的变化。