短语词组短語coal and gas bursting 煤與瓦斯突出coal containing gas 含瓦斯煤Coal Mine Gas Prediction 煤鑛瓦斯預測coal over gas 繙譯coal related gas 煤型氣coal seam gas content 煤層瓦斯含量developing coal seam gas 開發煤層氣 返回 coal gas