The good man is the man who, no matter how morally unworthy he has been, is moving to become better.
好人是那个,无论他以前有多么道德上不值得,都在努力变得更好的人。
The galactic center is a unique natural experiment in strong gravity.
每天学习,尤其是从别人的经验中学习。它更便宜!“——约翰·博格尔