采矿技术的创新不仅仅是效率问题，还关乎安全和可持续性。
Innovation in mining technology isn't just about efficiency—it's about safety and sustainability.
How can our great society tolerate the continued brutalization of its citizens by crazed misfits? Criminals must be told that their CIVIL LIBERTIES END WHEN AN ATTACK ON OUR SAFETY BEGINS!
我们教授一门学科不是为了培养关于该学科的小型活图书馆，而是让学生自己学会数学思考。
The best way to escape from a problem is to solve it.