safety pillar meaning in Chinese
保安矿柱
Examples
- No safety pillars shall be mined without authorization and no dangerous methods , such as water bursting , blasting and breaking through roadways , which may threaten the production safety of adjacent coal mines shall be adopted
采矿作业不得擅自开采保安煤柱，不得采用可能危及相邻煤矿生产安全的决水、爆破、贯通巷道等危险方法。