To understand the present, we must understand the past.

Success is not final, failure is not fatal: it is the courage to continue that counts.

我们致力于在继续提供世界所需能源的同时减少碳足迹。

The landscape of string theory is vast and complex, with perhaps 10^500 different possible universes.

Overfishing is a theft from future generations.

解释：不可以不知道活着的乐趣，也不可以不知道虚度光阴的担忧。