让自我高兴起来的最好办法就是设法让别人高兴起来。
The best way to cheer yourself up is to try to cheer somebody else up.
Poetry is not a luxury, but a necessity.
The best decisions aren't made with your head, but with your heart.
密码学的目标是使破解系统的成本超过受保护信息的价值。