In mining coal things, li siguang introduced to them, but a person who is currently prison.
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in mining coal things
在开采煤炭方面
以上为机器翻译结果，长、整句建议使用 人工翻译 。
All other things equal, the mining of that tonne might raise the value of the coal that remains in the ground, leaving the value of coal assets unchanged.
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