世有无妄之福，又有无妄之祸。
译文：世人有时会遇到意想不到的福运，有时也会遇到意外的灾祸。
可持续性不是一个流行词，而是对后代的承诺。
I'm a great believer in luck, and I find the harder I work the more I have of it.
The most important property of a program is whether it accomplishes the intention of its user.
Covenants, without the sword, are but words, and of no strength to secure a man at all.
The development of the drone industry is ultimately to serve humans, not to replace them.