社会结构因此被定义为实际存在的社会关系的总网络。
追求数学知识是一场永无止境的冒险。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
人们有时因为害怕自己受伤,而伤害了他人。
To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death.