A society grows great when old men plant trees whose shade they know they shall never sit in.

写作是一种自由的行为，是表达无法表达之物的方式。

"The security of quantum communication comes from the laws of physics, not from computational complexity."

生活工作首先勤快才能有所闲暇，一切事务都能处理得当才能逍遥自在。