穷人不是需要解决的问题，而是需要拥抱的机会。
Sustainability isn't a department; it's a design principle that must permeate everything we create.
记忆是一件复杂的事情，是真相的亲戚，但不是它的双胞胎。
The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
The study of mathematics is a journey without an end.