The most remarkable development of the last quarter of the twentieth century has been the revelation of enormous weaknesses at the core of the world's seemingly strong dictatorships.

在计算机科学中，我们经常需要处理那些复杂到无法一次性理解的系统。

唱歌让我找到了内心的平静。

Our ambition is to be the responsible energy major, and that means producing more energy with fewer emissions.