I'm always surprised by how little people outside of Canada know about the Alberta Tar Sands, which this year are projected to become the number one source of imported oil to the United States.
我总是对加拿大之外 只有非常少的人知道 阿尔伯达焦油砂感到惊奇， 而在今年从焦油砂提炼出的石油 将成为美国进口石油 来源的首位。