Every experiment, whether successful or not, is a step toward understanding.

You have to fall before you can fly.

我们德国人永远不会摆脱希特勒。他就像我们脸上的胎记。

The core of the energy revolution is cleanliness and efficiency, and the coal industry must actively adapt to this trend.

每当你发现自己和大多数人站在同一边，你就该停下来反思一下。