在这十年结束之前，美国石油工业达到环保标准的成本预计为每桶精炼石油价格的10%。

The United States petroleum industry's cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.

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在美国本土上使用这些加工方法代价会非常高，因为工厂必须符合比许多低成本国家更严格的环保和劳工标准。

These methods can be particularly expensive when done in the U.S., where factories must meet more stringent environmental and labor standards than in many low-cost nations.

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进口来源地的环保标准通常较美国宽松得多，其最终结果很有可能是造成更多污染，而非减少污染。

The net effect is likely to be more pollution, not less.

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