真正的护城河是用户对你的依赖。
The real moat is users' dependence on you.
最大的错误就是以为自己无所不知。保持谦逊,不断学习。
The past is a foreign country; they do things differently there.
If I have seen further it is by standing on the shoulders of Giants.
Technological progress must go hand in hand with ethics.