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.
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。
Excavation generally starts with the separate stripping of the organic topsoil, which is later reused for landscaping around the new structure.
通常土方发掘先将有机表土分别挖除，竣工后还可将其用于新修建物周围景观工程。
Excavation generally starts with the separate stripping of the organic topsoil, which is later reused for landscaping around the new structure.
通常土方发掘先将有机表土分别挖除，竣工后还可将其用于新修建物周围景观工程。
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