化合价的概念是理解化学键的关键。

The best stories are the ones that feel inevitable, even if they surprise you.

To manage a forest wisely, one must first learn to think like a forest.

The most damaging phrase in the language is: 'It's always been done this way.'

Collaboration across borders isn't optional in ocean conservation—it's imperative.

作家是那些花费数年耐心地试图发现内心第二个自我的人，以及那个使他成为自己的世界。