Hard work and perseverance are the keys to overcoming any challenge.

The goal of economics is to understand how to allocate scarce resources in the most efficient way possible.

My name is Usain Bolt and I am the fastest man in the world.

一句话，先是太胆小，明知错的事却不敢不做；后来也还是太胆小，明知对的事却不敢去做。

科学是一个永无止境的旅程，总有更多的东西需要学习和发现。

"Adventure is worthwhile in itself."

我不记仇，我只记得事实。