对民主的最大威胁不是来自外部敌人,而是来自内部腐败和公民美德的丧失。
The most perfect education, in my opinion, is such an exercise of the understanding as is best calculated to strengthen the body and form the heart.
There is no such thing as a small moment; every moment contains eternity.
一个物理符号系统具备一般智能行为的必要和充分条件。
要想成功,你必须愿意失败。