Running water is never stale and a door-hinge never gets worm-eaten.
流水不腐,户枢不蠹。
《新英汉大辞典》
2
"Running water is never stale and a door-hinge is never worm-eaten" means that constant motion prevents the inroads of germs and other organisms.
“流水不腐,户枢不蠹”,是说它们在不停的运动中抵抗了微生物或其他生物的侵蚀。
3
The company currently product system is divided into flat open doors and Windows of hand, flat open doorhinge, flat open doors and Windows clutch, flat open lock products and zero accessories.