世界是一个谜,我们都是侦探。
Assume life will be really tough, and then ask if you can handle it.If the answer is yes, you've won.
理论和实践的区别在于,理论上,理论和实践没有区别,但在实践中,却有区别。
The computer is just a tool. The pencil is also a tool. It's about how you use it.