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to phrases
coal district
expl.
煤产地
煤田受后期构造变动的影响而分隔开的一些单独的含煤岩系分布区, 或面积和储量都较小的煤田〈面积由几平方公里到几十平方公里〉
coal district:
3 phrases
in 2 subjects
Economy
1
Technology
2
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