天然气是一种洁净的能源，在国家环保安全和能源保障方面具有重要意义。
Natural gas is a kind of clean energy source and is important in the security of national environmental protection and energy source.
说明了煤炭在我国能源中的地位及型煤是我国洁净煤中的首选技术，其可带来巨大的环保和经济效益；
The article expounds the coal occupies important status in our country's power and the type-coal is the first technology of clean coal.
说明了煤炭在我国能源中的地位及型煤是我国洁净煤中的首选技术，其可带来巨大的环保和经济效益；
The article expounds the coal occupies important status in our country's power and the type-coal is the first technology of clean coal.
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