例如，一些油砂开采公司由于缺少大型推土机而无法增加产量。
Oil sands companies can't increase production because they can't get tires for their big earthmovers, for example.
去年，安桥公司输油管道在密歇根州发生破裂，这条负责输送油砂类型原油的管道长期存在问题。
The Enbridge line that ruptured last year in Michigan, which was transporting oil sands crude, had a history of problems.
但剑桥能源咨询公司认为，如果是以“从油井到车轮”的方式，只计算汽车排气管排出的二氧化碳量，从油砂中提取石油只增加了5 ~ 15%的排放量。
But from "well to wheels", counting emissions from cars' exhaust pipes, tar sands are only 5-15% dirtier, says IHS CERA.
乔治先生辩解道，在本世纪到来之前，各公司都在为油砂开采不盈利而发愁，无暇它顾。
Only since the turn of the century have the companies cracked the economics of the tar sands, argues Mr George.
据熟悉信实公司想法的人说，该公司还在觊觎着其他外国资产，其中包括加拿大公司ValueCreationInc .，后者在加拿大的阿尔伯塔省拥有大量的油砂储量。
Reliance also is scouting other foreign targets, including Canada's Value Creation inc., which has large oil-sands deposits in Alberta, people familiar with the company's thinking said.
美国有几家公司正在进行美国油砂的抽提研究和中型试验，尚无工业生产。
In the United States, several companies are conducting research and medium-scale experiment on extracting oil from oil sand and no commercial production has started yet.
美国有几家公司正在进行美国油砂的抽提研究和中型试验，尚无工业生产。
In the United States, several companies are conducting research and medium-scale experiment on extracting oil from oil sand and no commercial production has started yet.
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