流水不腐，户枢不蠹

Explanation: Rancid; pivot door axis; beetles bore. The flow of water will not smell, often turning the door axis does not decay. Things that regular exercise is not easy metaphor eroded. 　　Usage: Complex sentence; as subject, object; metaphor regular exercise are less vulnerable to erosion of what 　　Source: "Lu count them out," water does not rot, a door hinge is not cricket, moving also. " 　　Examples: ~, "Is that they are in constant movement resist the erosion of microbial or other biological. ★ Mao Zedong," On Coalition Government " Thesaurus:  a door-hinge is never worm-eaten, Glide Not rot, door pivot immortalisation, Door pivot Not Gryllotalpa africona