The only truly secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards - and even then I have my doubts.
打铁必须趁热,但是要磨光它则不妨从容。
嗅觉系统的美在于它既简单又复杂,使我们能够检测和区分几乎无限数量的气味。
The architect must be a poet.