After a storm, gravity water is in transit through the larger soil pore spaces. Capillary water
is drawn through small pore spaces by capillary action and is available for plant uptake.
暴雨之后，水在重力的作用下透过土壤中较大的颗粒间隙.在较小土壤颗粒缝隙中的
水则由于毛细管作用上升而被植物吸收.
Hygroscopic moisture is held in place by molecular forces during all except the driest
climatic conditions。Moisture, from the zone of aeration cannot be tapped as a water supply source
在不是最干燥的气候条件下，土壤湿气中的水蒸汽分子会因为分子间引力—范氏力被
土壤稳定下来,地表通气层的湿气不能通过凿井方式作为供水水源。
gravity water 重力水
capillary action 毛细作用
pore n. 孔
hygroscopic adj. 吸湿的
capillary n. 毛细管，毛细血管
molecular adj. 分子的
aeration n. 通风，换气
tap v.(从容器等）汲取（液体）