The streets were dark with something more than night.

用度少，则金价低贱；金价贱，则事情难成。

最好的数学是简单的，但又不至于过于简单。

这个世界充满了渴望被爱的人。

In the ocean of science, every question is an unknown island waiting to be discovered and explored.

采矿业有能力改变社区，但前提是我们必须负责任地去做。