煤炭经济的这种运行表现有其历史必然性，也有现实原因。
This kind of coal economic performance had not only its historical inevitability but also realistic reasons.
该现象形成的原因较为复杂，既有历史原因，也有现实原因。
The cause to form it is very complex, of both historic and real present.
既有历史原因，也有现实原因；既有物质原因，也有精神原因。
The cause leading to such situation can be talked about from many aspects such as history, reality and spirit factors.
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