化学是一门研究物质性质及其变化的科学。

"The most important thing in empirical work is to be clear about the question you are trying to answer."

In times of change, the learners inherit the earth, while the learned find themselves beautifully equipped to deal with a world that no longer exists.

Overhead, without any fuss, the stars were going out.

你的狗叫不了是因为我。

Sustainability is not an option; it's a necessity for any business that wants to thrive in the long term.