◎ 流水不腐，户枢不蝼 liú shuǐ bù fǔ, hù shū bù lóu

1. [flowing water does not rot; a door-hinge is never worm-eaten] 流动的水不会发臭，经常转动的门轴不会被虫蛀蚀。比喻经常运动的事物不易受外物侵蚀。