Objective: to study the method of laparoscopic bile duct exploration and extraction of bile duct stones.

目的：探讨腹腔镜下胆总管探查胆道取石的方法。

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Oil is particularly abundant in some regions of the world, but its exploration and extraction is expensive and not much easier.

石油是在世界一些地区特别丰富，但其勘探和开采是昂贵的，而不是更容易。

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A report in The Wall Street Journal Sunday showed that despite falling prices, investors are still eager to fund oil exploration and extraction efforts here in the U. S.

《华尔街日报》上周日指出，尽管油价不断下跌，投资者仍然很愿意为美国的石油勘探和精炼提供资金。

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For instance, a major decline in global economic growth will lower crude oil prices which will impact investments in exploration and extraction of oil.

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Because big exploration, extraction and infrastructure investments required pots of capital, long-term contracts became an industry norm.

ECONOMIST: Shale gas should make the world a cleaner, safer place

The data is based on research into current and projected oil production levels, extraction costs, exploration projects that are underway or in the pipeline and growth projections for developed and developing nations.

FORBES: Magazine Article