Critical comments by students should be taken in a friendly spirit， accumulation of material should not stifle the student’s independence.

【释义】狡猾的兔子有三个洞穴，才能避免死亡。如今您只有一个洞穴，还不能高枕无忧。请让我为您再开凿两个洞穴。

The world needs responsible miners who understand the value of both minerals and the planet.

创新始于质疑现状。