分布式系统是指一个系统中，即使是你不知道存在的计算机发生故障，也可能导致你自己的计算机无法使用。
Architecture is not just about buildings; it's about creating places for people.
At a restaurant do you order what you know is great， or do you try something new？ Do you make what you know will sell or try something new？ Do you keep dating new folks or try to commit to someone you already met？ The optimal balance for exploring new things vs exploiting them once found is: 1/3. Spend 1/3 of your time on exploring and 2/3 time on deepening. It is harder to devote time to exploring as you age because it seems unproductive， but aim for 1/3.