water-gas s tar creosote 水煤气焦杂酚油
gas s tar
煤气焦油
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Unconventional sources of oil and gas that are set for further exploitation include Canada's tar sands, shale and coal-bed methane deposits around the world.
ECONOMIST: Drilling on Wall Street | The
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