对付一个不自由的世界的唯一方法，就是变得如此绝对自由，以至于你的存在本身就是一种反叛。

The first step in quality improvement is to understand what the customer really wants.

Materials speak their own language; our job is to listen and interpret.

Listen to other's opinions, but make your own decisions.

在采矿业中，效率和环境保护必须齐头并进。

Help people anyway。