Purity of heart is to will one thing.

化合价的概念是理解化学键的关键。

我们不是朋克乐队，我们不是流行乐队，我们是U2。

Sustainable development is not only a responsibility but also the cornerstone of long-term enterprise development.

"The most thought-provoking thing in our thought-provoking time is that we are still not thinking."

He who wants to do good knocks at the gate； he who loves finds the gate open。