我不是没素材了,我只是没时间了。
相信你能做到,你已经成功了一半。
You have to believe in yourself when no one else does.
最成功的现代国家是那些能够利用市场力量,同时保持一个能够提供公共产品和规范私人活动的强大国家的国家。
The true power of mathematics is not in its complexity, but in its simplicity and elegance.