soft break meaning in English
鸟鸟冲
Examples
- Study on support technology for very soft broken rock mine roadway in wannian coal mine
万年煤矿极松软破碎岩体巷道支护技术研究 - Mine fire control in fully mechanized coal caving face in high gassy flammable soft broken seam
高瓦斯易燃松软破碎煤层综放工作面火灾的防治