This material forms a thick, weighty and highly abrasive sludge that must be transported from the flotation cells, where the copper is extracted, to a mine tailings disposal area.

这种物质会形成浓厚的、沉重的、具有很强研磨性的污泥，这种污泥需要从萃取铜的浮选槽中传输出来，然后输送到矿尾的处置区域。

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As reflected in Executive Order 13085, the full implementation of the Agreement Between the Government of the United States of America and the Government of the Russian Federation Concerning the Disposition of Highly Enriched Uranium Extracted from Nuclear Weapons, dated February 18, 1993, and related contracts and agreements (collectively, the "HEU Agreements") is essential to the attainment of this goal.

WHITEHOUSE: Executive Order--Russian Highly Enriched Uranium

Shale gas is natural gas that is trapped inside shale rock and is extracted by using a technology called hydraulic fracturing, where highly pressurized water mixed with sand and chemicals is used to crack open rocks.

FORBES: Will ConocoPhillips Help China Tap Its Shale Gas Reserves?