Senses
流水不腐，户枢不蠹/ 流水不腐，戶樞不蠹 constant activity prevents decay
literally 'flowing water does not rot, and a door hinge is never eaten by worms'; used as a metaphor for how things that stay active do not deteriorate and can maintain their vitality
流水不腐，户枢不蠹/ 流水不腐，戶樞不蠹 constant motion prevents decay
running water does not go stale and a door hinge is never eaten by worms; implies that constant activity and movement prevent things from deteriorating