凡事不能只看表面现象。钓鱼人虽然躬着身子，并不是因为对鱼恭敬；捕捉老鼠的人，把虫子留给老鼠吃，并不是因为喜爱老鼠。

编程语言中最重要的东西是语义，而不是语法。

If you cannot do it, then teach.

Don’t take it personally when someone turns you down. Assume they are like you: busy， occupied， distracted. Try again later. It’s amazing how often a second try works.