导坑底板 2) bottom heading 底导坑 3) bottom of foundation pit 基坑底板 例句>> 4) abrasion dents on floor 底板冲坑 5) floor of gallery 矿坑底板 6) water bursting in pit floor 矿坑底板突水 1. Research on a cusp catastrophic model ofwater bursting in pit floors; ...