The SongHua river has been polluted last week. The goverment has stopped the tap water,so the people in harbin get some trouble about drinking the water.It is a difficult problem, because nobody can live well without the water.So the goverment try its best to find the way to slove the problem. At the same time, many cities give help to Harbin, hundreds of trucks transport the water to Harbin.Everybody need others help when they get trouble. Like people ,like city. Our country likes a big family, the city is the member of the family. Like the family, helping each other is responsilblity of every member.