The world is a mirror, and it reflects our ugliness.
The P versus NP problem is one of the most important unsolved problems in computer science.
I'm not going to change who I am because of what people say.
教师在学校里不是为了强加某些观念或形成某些习惯,而是作为社区的一员,选择影响孩子的因素,并帮助他适当地回应这些影响。
The purpose of life is the pursuit of truth and virtue.