How can you explain that there is a lot of precipitation near the equator, and very little in the regions of the poles?

In the equatorial zone, there is a lot of precipitation all year round, in this zone there is no seasonality and moisture is supplied stably throughout all 365 days. This is due to the fact that near the equator the climate is very warm and there is a lot of evaporation here, and the air is saturated with moisture. Also, a zone of low atmospheric pressure forms near the equator, and winds carrying a large amount of moisture blow from the north and south (where the pressure is high) towards the equator. And at the poles, atmospheric pressure is higher than in other zones, and the winds blow from there, taking moisture with them.