可持续性不是一种趋势;这是我们对后代的责任。
Psychology must be based on observable phenomena, not abstractions.
To do mathematics is to engage in an act of discovery and conjecture, intuition and inspiration.
我一直是个乐观主义者,我想这源于我相信创造力和智慧的力量可以让世界变得更美好。