Water is the source of life.We can't live without water.However,with the increasing population and industrial development,water pollution has become a serious problem.Large amounts of wastewater go into rivers and seas directly without being treated,which can be dangerous to people.Also lots of people pay no attention to saving water in daily life,while in some place water is badly needed.It's time for us to take some measures to improve the situation.Factories should treat the wastewater before letting it go into rivers.We can play apositive role in saving water.For example we can reuse the water for wishing rice to wash vegetables and then clean a mop