用户体验差1%，在规模化后就是100%的灾难。
A 1% drop in user experience becomes a 100% disaster at scale.
Our fans have grown with us, and that's something really special.
When you want to change things, you can't please everyone. If you do please everyone, you aren't making enough progress.
相位裕度是系统在变得不稳定之前可以容忍的程度的度量。