过去是一个影子，总是跟随，但从未追上。
The study of quantum gravity is essential for understanding the early universe.
The path to discovery is rarely a straight line.
The only way to do great work is to love what you do.
确保和平的唯一方式就是随时准备战争。
人类的大脑是一台自欺欺人的机器；我们只看到我们想看到的。
The truth is, if you ask me what I think about anything, I’ll tell you. I’m not afraid to say what I think.