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
He put one worm in a glass of water and another worm in a glass of whiskey.The worm in the water lived, while the one in the whiskey curled up and died.
He put one worm in a glass of water and another worm in a glass of whiskey. The worm in the water lived, while the one in the whiskey curled up and died.