Water Resource Protection
We human beings cannot live without water,and water resource is limited,but nowadays,much water is polluted and wasted.
Many factories discharge waste water into rivers,lakes and even seas.Water pollution has become a threading problem to the earth.
And a lot of people waste water in their daily lives.For example,many would leave the tap running after their washing hands,and other people would not reuse the water.
Once polluted or wasted,water cannot be regenerated.So we must protect the water resource.