Every challenge is an opportunity in disguise; you just have to look for it.
The essence of mathematics lies in its freedom.
动作是完整思考过程的最后一部分,精神的提升必须借助于活动或工作。
I am not without possessions; I have freedom.
真正的创新源于理解消费者未被满足的需求,并有勇气采取行动。