一本好书的衡量标准在于它让你思考和感受的程度。
The internet is a tool that can be used for good or bad. It's up to us to decide how we use it.
最好的设计是那些能解决问题而不会带来新问题的设计。
The real challenge is not in solving the equations, but in understanding what the solutions mean.
Symbols are the medium of thought.