学习数学的最佳方式就是动手做数学。
The best way to learn mathematics is to do mathematics.
年轻人并不堕落;他们只有在成年人已经堕落时才会被宠坏。
建立信任需要时间,但它是每一段牢固关系的基础。
The strongest is never strong enough to be always the master, unless he transforms strength into right, and obedience into duty.