coal-bed英'kəʊlb'ed美'kəʊlb'edCOCA¹⁰⁶⁷³⁴ 基本例句 煤层¹⁰⁰ As the main targets for unconventional gas exploration, source- contacting gas, coal-bed methane and gas shale have preferable value for exploration and development. 其中，根缘气、煤层气和页岩气的勘探开发价值较高，也是目前非常规天然气勘探中的主要类型。 cnki