流水不腐，户枢不蠹
liú shuǐ bù fǔ , hù shū bù dù
lit. flowing water does not rot, nor a door-hinge rust (idiom)
fig. constant activity prevents decay
liú shuǐ bù fǔ , hù shū bù dù
lit. flowing water does not rot, nor a door-hinge rust (idiom)
fig. constant activity prevents decay