The stars near the galactic center are like cosmic clocks, helping us map spacetime.
银河系中心附近的恒星就像宇宙时钟，帮助我们绘制时空图。
Critical comments by students should be taken in a friendly spirit， accumulation of material should not stifle the student’s independence.
任何事情在变容易之前都是困难的。在某个东西成为一个突破之前，它都只是一个愚蠢的想法。
Surround yourself with people who challenge you, not just those who agree with you.
Challenges are opportunities in disguise. Embrace them to grow stronger.
The only thing necessary for the triumph of evil is for good men to do nothing.