Program testing can be used to show the presence of bugs, but never to show their absence!

"We don't take ourselves too seriously, we just have fun."

"A book is a treasure that never loses its value."

自由是为自己的人生负责。

The ruling ideas of each age have ever been the ideas of its ruling class.

Intelligent mining is the key to high-quality development in the coal industry.

世界上最好和最美丽的东西是看不见甚至摸不着的——它们必须用心去感受。