颠倒，永远颠倒：把情况或问题颠倒过来。倒过来看。

"The only real progress lies in learning to be wrong all alone."

Stay true to yourself and never let anyone change you.

Carpe. Hear it? Carpe. Carpe diem. Seize the day, boys. Make your lives extraordinary.

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.