deep seam meaning in English
凹缝
Examples
- Practice on bolt beam steel mesh combined support in deep seam roadway
深部全煤巷道锚梁网支护实践 - The research of supporting technology of the tender coal seam workings in deep seam in nantun colliery
南屯煤矿深部松软煤层巷道支护技术研究
凹缝