non-processed natural gas 未处理的天然气
processed natural gas
加工天然气
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mr. TIFFANY: There are some ethanol plants that have been built that are using coal instead of natural gas for their processed heat.
NPR: Does Backing Biofuels with Public Money Work?
As a consequence, out of the thousands of sources of natural gas that exist, only 14 are being processed for their helium content.
CNN: U.S. needs a strategy on helium
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