underground coal gasification 基本例句 煤地下气化 This paper discusses the principle of coal gasitication underground and experimental means.对国内外煤地下气化研究理论及实验方法进行了概括性叙述。 Great progress on research forunderground coal gasificationtechnology has been also obtained in China.我国对煤炭地下气化技术的研究取得了很大进展。