学习数学的最好方法就是做数学。
The best way to learn mathematics is to do mathematics.
如果你不能安全地开采它,你根本不应该开采它。
"To write is to resist the erosion of time."
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.
Die Hoffnung ist der Schlüssel zum Leben.