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.
探索电子系统的拓扑方面不仅加深了我们对量子力学的理解，还为革命性技术铺平了道路。
Psychological concepts must prove their worth in action.
The ocean doesn’t belong to us; we belong to the ocean. Our responsibility is to nurture it.
Psychology is concerned with the what and how of mental life, not the why.