The application of a new system for developing an operatingmine is a complex problem whose solution is expected to satisfy a number of conflicting requirements.
将一种新的采矿方法应用到已采矿山会有许多复杂的问题有待解决，因为相互矛盾的要求需要得到满意的解决。
2
The mine began operating in 1990.
该铜矿于1990年开始运营。
3
After the earthquake, the epicenter about 15 kilometers away from the mine, quickly operating more than 200 miners were underground to evacuate all without casualties.