Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.
儿童书籍应该既是一面镜子，也是一扇窗户。
Don't let success get to your head, and don't let failure get to your heart.
计算机科学中的真正挑战不是编写程序，而是理解计算的本质。
梦想不是追逐的，而是创造的。
Innovation is not imagination out of thin air, but based on a deep understanding of user needs.