在一些国家由地下水供给的水是仅有的可用水源。
In some countries the supply of water from underground can be the only source of water available.
如果人们大量利用额外土地，继续扩大肥料和杀虫剂的使用范围，进一步损耗日益减少的地下水供给的话，那将会是很容易的。
Easy, that is, if the world brings into play swathes of extra land, spreads still more fertilizers and pesticides, and further depletes already scarce groundwater supplies.
研究结果表明，红胶泥和风化岩沫土土壤地类主要位于沟谷两岸，地下水供给较为充裕，是浅根性树木生长发育的良好土壤类型；
The research indicates that red clay and mantle rock soil, which distribute both sides of gully and with rich groundwater, are better for shallow-root tree to grow.
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