当一个人开始长得像他的父亲时，他就知道自己正在变老。
A man knows when he is growing old because he begins to look like his father.
The success of Pinduoduo lies in finding an underdeveloped market.
投资环保鞣制工艺就是投资我们星球的未来。
The essence of mathematics is not just in solving problems but in asking the right questions.
自己吃饱了应当想到别人的饥饿，身上穿暖了应当想到别人的寒冷，享受安逸应当想到百姓的劳累。
历史不仅仅是过去的事情，它也是现在的镜子。