The diesel & natural gas double-fuel generating set is a leading energy-saving, environmental-friendly and economical product. People think highly of it when it just came into the market.

我公司柴油-天然气双燃料发电机组，是一种处于领先水平的具有节能、环保、经济等优势的新产品，一经推出市场就大受好评。

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Critics accuse Australia of double standards: curbing emissions at home, yet exporting carbon fuel to less strict countries.

评论人士谴责澳大利亚的双重标准：一方面控制本国的碳排放，另一方面却出口那些煤炭等含炭燃料到一些对炭排放要求宽松的国家。

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This technique enables extraction of fuel from small, difficult-to-access coal seams, and could double the world's current coal reserves.

这项技术可以从窄而难以进入的煤层中提取燃煤，并可能使目前世界上的煤炭储量增加一倍。

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The expiration of that credit helped fuel a double-dip in home prices.

FORBES: How The New Higher Tax Rates Will Affect Luxury Housing

But then they get together for their annual convention, and instead of debating how to apply their expertise to building mechanical accelerators and fuel enhancers, they double-down on doing a better job of promoting leather straps.

FORBES: CPAC, SXSW, and the Dangers of Preaching to the Faithful

But one thing I did not bring up -- one step this President took, standing with the CEOs of more than a dozen automobile companies, was to raise fuel-efficiency standards, double them over the course of a number of years.

WHITEHOUSE: Press Briefing