债券市场是市场心理的最终晴雨表。

如果一个孩子要保持他与生俱来的惊奇感，他至少需要一个能与之分享的成年人的陪伴，与他一起重新发现我们生活的世界的快乐、兴奋和神秘。

P与NP问题是计算机科学中最重要的一个问题之一。

But it is the same with man as with the tree. The more he seeks to rise into the height and light, the more vigorously do his roots struggle earthword, downword, into the dark, the deep - into evil.

在当今世界，数字技能和读写能力一样重要。

The mind is a dynamic system of processes.