activities underground pressure的用法和样例：
- They were forced to shift their activities underground.
- Underground pressure and timbering technology in laneway construction in soft rock mass is one of the complicated technical problems.
- Underground pressure mostly acts upon the mining accesses and connections when sublevel caving without sill-pillar is used.
- Rock-bursting is a special underground pressure behavior in deep mining in China currently and it intimidates seriously the safe mining.
- According to the underground pressure theory, which takes stratum movement as key matter, the nonelastic area occurs in coal body under the action of underground pressure.