油价走低时，掌握炼油和零售业务具有重要的意义，因为这两项业务能够提供稳定的资金流，用于新油井的勘探和开采。
When oil prices are low, it makes sense to have a hand in the refining and retail businesses, since both provide a steady stream of money that can fund searching for new Wells and drilling.
研究露天开采边坡的安全稳定对露天矿山的安全生产具有重要意义。
Research on the safety and stability of slope in open-pit mining is very significant to safety production of open mines.
所得结论对注气开采煤层气设计和评价具有指导意义。
These conclusions have guidance significance to exploitation coal bed methane by gas injection.
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