Water in the sand between the two pots evaporates through the surface of the larger pot , where drier outside air is moving .
两个罐子中间沙子的水分通过大罐的表面蒸发,使大罐外部的干燥空气开始流动。
Under cloudless skies the surface heats and gives up its moisture , making things at ground level hotter and drier while not increasing the chances of rain .
Water abounds in this region today , but it was once far drier .
这个地区如今水资源十分丰富,但它曾经非常干旱。
This would allow them to thrive in hotter , drier conditions .
这样它们就能在更炎热、更干旱的条件下存活。
The cultivation of crops has expanded into progressively drier regions as population densities have grown .
随着人口密度越来越大,作物垦殖范围逐渐扩大到不适宜垦殖的干旱地区。
Water buck , hippo and water fowl gave way to animals such as pig and antelope which could survive drier conditions .
水羚、河马和水鸟让位给诸如猪、羚羊等能够在较干旱的环境中生存的动物。
The need to restrict farming with subsidised water in a drier south-western united states does not mean that the political means of doing so will be found before damage is done .