We're at the Munich train station and it's about time to say " auf Wiedersehn" to Germany.
我们在慕尼黑火车站， 是时候对德国说“auf Wiedersehn” 了。
英语百科
aufs
aufs (short for advanced multi layered unification filesystem) implements a union mount for Linux file systems.
Developed by Junjiro Okajima in 2006, aufs is a complete rewrite of the earlier UnionFS. It aimed to improve reliability and performance, but also introduced some new concepts, like writable branch balancing, and other improvements – some of which are now implemented in the UnionFS 2.x branch.