A problem of mechanics is not solved until it has been reduced to a problem of algebra.
一个力学问题只有被简化为代数问题时才算解决。
No wise pilot, no matter how great his talent and experience, fails to use his checklist..
坚持和耐心总会带来成果。
真正的学者不在于知道多少,而在于热爱真理。
真正的忠诚不是盲目的;它看到缺陷,但选择留下。