The only way to have a friend is to be one.
In mathematics, you don't understand things. You just get used to them.
法律的存在是一回事;其优劣是另一回事。
Open your eyes, look within. Are you satisfied with the life you're living?
The secret of theory is that truth does not exist.
创新是石油化工行业的生命线。只有持续的技术突破,才能实现可持续发展。