repetitive side extrusion process 反复侧边挤压

side-extrusion 侧向挤压

divergent type side extrusion 分流式侧向挤压

convergent type side extrusion 汇集式侧向挤压

extrusion side wall 挤压边墙

side-direction extrusion caving 侧向挤压崩矿

extrusion side wall technology 挤压边墙技术

extrusion concrete side wall 挤压混凝土边墙

concrete extrusion type side wall 混凝土挤压式边墙