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- environmental aspects (1)
- fossil fuels (1)
- geopolitics (1)
- history / world (1)
- petroleum industry and trade (1)
- petroleum pipelines (1)
- political aspects (1)
- power resoruces (1)
- technology & engineering / power resources / fossil fuels (1)
- 油气资源 (1)
- 研究 (1)
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