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Nowadays , there are more and more XX in some big cities . It is estimated that . Why have there been so many XX ? Maybe the reasons can be listed as follows. The first one is that .Besides, . The third reason is . To sum up , the main cause of XX is due to . It is high time that something were done upon it. For one thing , . On the other hand , . All these measures will certainly reduce the number of XX . 注释： (1)用具体数据说明XX现象; (2)原因一; (3)原因二; (4)原因三; (5)指出主要原因; (6)解决建议一; (7)解决建议二。 范文：Generation gap between parents and children Nowadays , there are more and more misunderstanding between parents and children which is so- called generation gap . It is estimated that . Why have there been so much misunderstanding between parents and children? Maybe the reasons can be listed as follows . The first one is that . Besides . The third reason is .To sum up ,the main cause of XX is due to . It is high time that something were done upon it. For one thing . On the other hand , . All these measures will certainly bridge the generation gap . | 
