1·Someone used a bulldozer and plowed a two-foot-deep gash in the desert, unearthing the brick and bitumen remains of a stairway.
有人用推土机在沙漠里犁了一个两英尺深的瓦斯，挖出了楼梯的砖头和沥青残骸。
2·Just last month someone used a bulldozer and plowed a two-foot-deep gash in the desert, unearthing the brick and bitumen remains of a stairway possibly leading to another cemetery.
就在上个月，还有人用推土机，在沙漠中犁出一个两英尺深的大裂缝，挖掘到一段楼梯的砖块和沥青碎片，这可能通向另一片墓地。
3·The most common technique in new projects involves injecting the bitumen with steam underground.
在新的工程中最常用的技术，则是往地下的沥青中注入蒸汽。
4·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.
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。
5·The method involves a piece of copper covered with light sensitive bitumen.
该方法用到一片铜片，上面用光敏感的沥青覆盖。