advancing working face的用法和样例：
- Again, according to analyze wall rock change along with working face advancing under caving, the paper gains three different phases of wall rock transmogrification.
- Based on an example, the distribution and dynamic procedure of air leakage seepage, oxygen, CO gas, methane and temperature in goaf during working face advancing are demonstrated.
- With the advancing of work face, the cracks will be induced and then impenetrate with each other in roof, and result in the rupture of roof and roof weighting.
- Stripper face must extend 1/8” below working face of punch.