没有冬天的寒冷，夏天的温暖又有什么意义呢？
"What good is the warmth of summer, without the cold of winter to give it sweetness."
"A good book is an event in my life."
要理解递归，首先必须理解递归。
The design of a system should be guided by the principle of least surprise, where the behavior of components is intuitive and predictable.
智慧是对痛苦的理解，对喜悦的感激，以及对过去的接受。
