First is the water in the pond water turns to the steam, then the waterdrop falls down, is rains along with it, the sun came out, the sunlight illumination water surface, in the pond also had the steam to rise. This is a water cycle .
恶性循环 [词典] vicious spiral; vicious circle; [经] vicious cycle; a vicious circle; a vicious spiral; [例句]内政大臣力图打破贫困和犯罪之间的恶性循环。The Home Secretary aims to break the vicious circle between disadvantage and crime
