How can the differences in the amount of precipitation in different climatic zones of Eurasia be explained?

Due to its gigantic size, Eurasia has a great extent from south to north and from east to west. On its surface there are several high and large mountain systems that affect the climate and precipitation. So, in the southern part of the continent, the climate is more humid and there is a lot of precipitation, since monsoon winds blow there. In the rest of the coastal zone, precipitation is moderate due to the humid sea air. In the central parts, less precipitation falls, as the mountains block the path of the clouds.