油田配电网覆盖面积大，对故障事件难以迅猛反应。
It is difficult to monitor fault event occurrence in distribution systems in oil. fields.
巴西是世界上国土面积第五大的国家，有530万平方公里的森林覆盖面积——大部分是在亚马逊河流域——但其中只有170万平方公里的森林受国家保护。
Brazil, the world's fifth largest country by area, has 5.3 million square kilometers of jungle and forests — mostly in the Amazon river basin — of which only 1.7 million are under state protection.
格陵兰大冰原上有一个融水湖泊，容量达440亿升，覆盖面积达5.7平方公里，在2006年，仅仅用了24小时就流光了。
A meltwater lake on the Greenland ice sheet that contained 44 billion litres and covered 5.7 sq km gurgled away within 24 hours in 2006.
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