излишек чего-л. над чем-л.
• The excess of evaporation over precipitation has to be made up by underground drainage from the less arid areas that supply the water.
Русско-английский научно-технический словарь• The excess of evaporation over precipitation has to be made up by underground drainage from the less arid areas that supply the water.
Русско-английский научно-технический словарь