户枢不蝼

Explanation: See "door hinge is worm-eaten." 　　Source: "Lu give all" water does not rot, door hinge Kera, moving also. "Don always" meaning forest, "Volume II cited as a door hinge is worm-eaten." Thesaurus:  a door-hinge is never worm-eaten, Glide Not rot, door pivot immortalisation, Running water is never stale and a door-hinges never get worm-eaten, practice keep one always fit