The mining, oil extraction, and gas extraction industries form yet another group.

从事采矿、采油和采气行业的焊工组成另外一个群体。

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There are four key industrial economic sectors: the primary sector, largely raw material extraction industries such as mining and farming;

有四个主要工业经济部门：初级部门，主要原材料的开采，如采矿业和农业；第二产业，涉及炼油，建筑，制造；

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Thus, joint ventures are common in resource extraction industries where capital costs are high and where the possibility of failure is also high.

因此，合资企业经常见于资本成本很高并且失败可能性也很高的资源开发产业中。

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It affects all "extraction" industries, including natural gas, coal, copper, diamonds and possibly timber.

FORBES: Seeing Through Big Oil

The Elimination of Double Subsidies for the Hard rock Mining Industry Act takes on depletion allowances for mineral extraction based industries.

FORBES: Connect

Still, the MIT report points out that shale-gas extraction uses less water than other industries, and indeed than other sources of energy.

ECONOMIST: Shale gas��s poor image in Europe is largely unjustified