Optimists tend to interpret their troubles as transient, controllable, and specific to one situation. Pessimists, on the other hand, believe that their troubles last forever, undermine everything they do, and are uncontrollable.

设计不只是外表和感觉，设计是产品如何运作。

The ultimate goal of machine learning is to make computers learn from experience and improve their performance on tasks over time.

生命的历史是无尽实验的故事。

天空才是极限。

武力不能维持和平。只有互相理解才可以。