In recent years , xx has caused a heated debate on .

　　The factors for .First of all ,.Then , there comes a case that . Moreover , .Especially when .

　　Indeed, these unique points can be collected theo remind people that .In this way ,we should behave just like .

　　范文：The impact of Television

　　In recent years , with the development of science and technology ,80 percent of all homes in China have satellite TV , offering as many as 50 channels .It has caused a heated debate on . Many parents are worried about the impact of so much television on children.

　　The factors for . First of all , . Then , there comes a case that . Moreover , . Especially when .

　　Indeed, these unique points can be connected to remind parents that . In this way , children will not be influented too deeply.