如果你想保护珍贵的东西，就必须把它锁起来，然后把钥匙扔掉。
If you want to keep something precious, you have to lock it up and throw away the key.
Like the meeting of the seagulls and the waves we meet and come near. The seagulls fly off,the waves roll away and we depart.
In computer science, we often deal with problems that are easy to state but hard to solve.
Every moment of one's existence one is growing into more or retreating into less.