Correct selection of source gases and their compositions is one of the critical factors for si trench etching.

源气体及组分的选择是硅槽刻蚀技术的关键因素。

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Our use of fossil fuels is the main source of excess greenhouse gases.

我们对化石燃料的使用是温室气体过量的主要来源。

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It focuses on the biggest human source of greenhouse gases - emissions of carbon dioxide, or CO2, from power plants.

NPR: Climate Change Grabs Congressional Attention

The rules for the oil sands, now the fastest growing source of greenhouse gases, have yet to be finalised and will not come into force until 2010.

ECONOMIST: Canada

Higher prices are needed to induce consumers and businesses to use less energy (the source of most greenhouse gases) and switch to fuels (from coal to natural gas) that have lower emissions.

CENTERFORSECURITYPOLICY: Center for Security Policy | Honesty is the Best Policy: Bush Must Do With The A.B.M. Treaty as He Has Done to the Kyoto Protocol