但是其主要成分是一种被称为沥青的焦油状物质。因此从地面开采和把他们运往提炼产都需要消耗大量的能源。
But they are made up of a tarry substance called bitumen, which requires large amounts of energy to extract from the ground and prepare for transport to a refinery.
典型的工艺是先钻井，然后通过井眼将蒸汽泵入地下，油砂中的沥青被蒸汽熔化，这样便容易被抽吸至地面。
Typically it involves drilling wells to pump steam into the ground to melt the bitumen and make it easier to suck up to the surface.
建筑的一端接到容纳看台座位的篮球场，通过暗色调的砖使其与庭院的沥青地面相融合。
One end of the building spliced off to accomodate the grandstand seating by the basketball court features darker-toned brickwork to help it blend in with the court's asphalt surface.
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