mine goaf

• 采空区

mine goaf的用法和样例：

例句

1. Prospecting metal mine goafs by Rayleigh wave method is introduced.
   介绍用瑞雷波法检测金属矿山采空区。
2. The coal spontaneous combustion in the goaf is one of the main coal disasters.
   采空区煤炭自燃火灾一直是我国煤矿的主要灾害之一。