Natural gas will play a critical role in the energy mix as we move toward a lower-carbon future.

Mathematics is not just a collection of abstract theories, but a language that describes the universe.

蓬草长在麻地里，不用扶它也能挺立；把白沙放在黑土里，白沙也就变成黑的了。这两个例子说明，环境对一个人的影响，是非常大的，所以才有了《孟母三迁》的故事。