zonal harmonic coefficient

例句：

1. 1. The zonal winds blow from the northwest to the southeast.
   纬向风从西北吹向东南。
2. 2. The zonal variation in temperature is due to the different altitudes.
   温度的纬向变化是由于不同海拔造成的。
3. 3. The zonal currents are responsible for the ocean currents.
   赤道流是海洋流动的原因。