民主城邦的基础是自由权。

I don't care about being liked. I care about being respected.

环境加时间等于命运。

If you want to understand a system, try changing it.

Technology is not just a tool. It can give learners a voice that they may not have had before.

煤炭的真正价值在于我们如何负责任地开采和使用它。