Once up and running, oil-sands mines produce a steady flow of oil for 30 years or more, whereas the output of more conventional fields is much less predictable.
一旦建成运行，油沙矿在之后的30年或更长的时间里将持续不断的提供石油资源，而那些传统的油田的产量相对而言缺少可预见性。
He looked back once, up that endless vista of autumn lane between the yellowing hedges.
他一度回头望望夹在半黄篱笆中间的那条无穷尽的秋色小径。
He looked back once, up that endless vista of autumn lane between the yellowing hedges.
他一度回头望望夹在变黄树篱中间的那条无穷无尽的秋色小径。
Once up on a time they were bad children.
很久以前他们是一群坏孩子。
Once up on a time they were bad children.
很久以前他们是一群坏孩子。
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