在大多数情况下，要从油沙中提炼出石油需要先把覆盖该地区的森林砍掉，排干地面的水分，去掉表层土然后当然就是把地下的油沙挖出来。
In most cases, extracting oil involves chopping down the forest that blankets the region, draining the boggy ground, stripping off the topsoil and literally digging up the oily sand below.
研究小组选取的岛普罗维登斯和水牛城在面积上差不多，同处美国东北部森林覆盖的地区。
Providence and Buffalo are roughly the same size, and both fall within the study area chosen by the research team: the forested environments in the northeastern United States.
目前为止，亚马孙州是巴西亚马逊地区9个州中森林保存得最完好的地区，原始森林的覆盖率高达97%。
Amazonas remains by far the best-preserved of Brazil's nine Amazon states, with about 97% of its original forest cover intact.
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