Xie Yanxin, is one ordinary coal miner in Xinzhuchun Company, Jiaozuo Coal Group, HNCC.

谢延信是河南煤化焦煤集团鑫珠春公司的一名普通矿工。

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It is a difficult problem to recognize the Yanxin cave-fractured reservoirs in southeast Sichuan.

川东、南地区阳新统缝洞储层识别是一难题。

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