We also found that Datong coal contains more phenolic hydroxyl and less carboxyl.

红外分析表明大同煤中羧基含量很少，酚羟基含量较多。

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Datong Coal Mine Group has gone through 60 years with the growth and stride of the great motherland.

伴随着伟大祖国成长、前进的步伐，大同煤矿集团走过了60年的历程。

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January 4, 1984, Datong Coal Mine Museum was renamed class education exhibition Datong Mining Bureau.

1984年1月4日，大同煤矿阶级教育馆更名为大同矿务局展览馆。

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But in the shadow of the coal mines in Datong there are different expectations.

BBC: China's coal conundrum as smog worsens