And PetroChina officials are exploring new shale gas and coal - bed methane opportunities over the country.

中石油的官员最近也在全国各地探测新的油页岩和煤层甲烷气矿藏.

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Yet the companies recognise that working shale gas is different from conventional production.

不过这些公司认识到,开采页岩气的方式与传统的天然气生产截然不同.

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