能源公司对此作出了简单的解释：石油与天然气价格自2003年以来就在迅猛增长。
Energy companies offer a simple explanation: oil and gas prices have soared since 2003.
长北气田是中国石油与壳牌公司合作的天然气开发项目。
Changbei project is a joint venture project for natural gas development between PetroChina and Shell.
长北气田是中国石油与壳牌公司合作的天然气开发项目。
Changbei project is a joint venture project for natural gas development between PetroChina and Shell.
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