计算机网络中最重要的东西是协议。
The most important thing in a computer network is the protocol.
译文：成家立业后才知道柴米的贵重，自己抚养孩子时才知道报答父母的恩情。赏析：世事的艰难，只有当我们亲身经历后才会懂得，生活的不易，只有当我们尝遍酸甜苦辣咸才会明白。
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.
书籍是最安静、最恒久的朋友；它们是最易接近、最睿智的顾问。