◎ 流水不腐，戶樞不螻 liú shuǐ bù fǔ, hù shū bù lóu

1. [flowing water does not rot; a door-hinge is never worm-eaten] 流動的水不會發臭，經常轉動的門軸不會被蟲蛀蝕。比喻經常運動的事物不易受外物侵蝕。