每个行为都有它的乐趣和它的代价。
Every action has its pleasures and its price.
The quest for efficient algorithms is, at its core, a mathematical endeavor that challenges our understanding of complexity and computability.
One can only display complex information in the mind. Like seeing, movement or flow or alteration of view is more important than the static picture, no matter how lovely.
The greatest killer of happiness is comparison. If you must compare， compare yourself to you yesterday
