加强国际合作，推动煤炭行业技术和管理水平的提升。

Happiness is as a butterfly which, when pursued, is always beyond our grasp, but which if you will sit down quietly, may alight upon you.

The language of mathematics is universal, transcending cultural and linguistic barriers.

The big money is not in buying or selling, but in the waiting.

永恒存在于无穷。

盈利和目的并不相互排斥，它们越来越相互依赖。