不腐

chéng zi kě yǐ cún fàng hěn cháng shí jiān ér bù fǔ

橙子可以存放很长时间而不腐。

Oranges can be kept for a long time without going mouldy.

liú shuǐ bù fǔ hù shū bù dù

流水不腐，户枢不蠹。

Running water is never stale and a door-hinge is never worm-eaten.