短语词组短语coal and gas bursting 煤与瓦斯突出coal containing gas 含瓦斯煤Coal Mine Gas Prediction 煤矿瓦斯预测coal over gas 翻译coal related gas 煤型气coal seam gas content 煤层瓦斯含量developing coal seam gas 开发煤层气 返回 coal gas