求翻译：水是地球最常见的物质，但是水来之不易！先有江河湖海里的水蒸发成水蒸气，集在云里，云里因为太多水了，所以形成了雨，最后把水净化成饮用水，所以说水来之不易！是什么意思？

Water is the most common substance of the Earth, but the water to come by! Rivers in the evaporation of water into steam, set in the cloud, because too much water in the cloud, and so formed the rain, and finally purified water into drinking water, so water to come by!