英語(yǔ)翻譯
When water is heated,it turns into vapor,when vapor is cooled,it turns into water.The air can hold certain amount of vapor at certain temperature.As the temperature goes up,the air can hold more.So heated water turns into vapor.vapor travels with air.When the air becomes cooler,it cannot hold that much vapor.Then vapor becomes water.When water falls from sky,it's called "rain".