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.
HVDC技术利用地下或者海底电缆，用于远距离的电力传输，而损耗较低。
HVDC technology is used to transport electrical power over long distances with low losses using underground or submarine cables.
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