学习数学的最佳方式就是动手做数学。
The best way to learn mathematics is to do mathematics.
The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.
If you don't make mistakes, you're not trying hard enough.
我们不是从祖先那里继承了海洋；我们是从子孙那里借来的。