在观察性研究中,我们常常不得不依赖于无法直接检验的假设。
 The world is a stage, and each person is an actor.
Efficiency is doing things right; effectiveness is doing the right things.
人生就像一盒巧克力,你永远不知道下一块会是什么味道。
The most advanced technology is useless without the wisdom to apply it properly.