一个人的记忆中可能只有一百个清晰的日子，而他已经活过了成千上万天。
"A man's memory might have only a hundred clear days in it and he has lived thousands."
"The only thing that is truly eternal is the human connection."
我们教授一门学科不是为了培养关于该学科的小型活图书馆，而是让学生自己学会数学思考。