I am writing this letter to call on all the students in our university to do something for Li Ping, one of our schoolmates, who is suffering from the serious disease. 　　As some of you may know, Li Ping is one of the freshmen the English Department. She is longing for the bright future like you and me . Unfortunately, last month, she was struck by Lerkemia. Now she is hospitalized and in a serious condition. What is worse, Li Ping comes from a poor village family and it si impossible for her family to raise such a large sum of money in such pressing time. 　　As you see, now Li Ping is in great nedd of fanancial aid and daily caring. So it is high time for you to extend your helping hands to her. If you would like to provide your love and care to Li Ping, especially in the form of donation, please call at 12345678 or 23456789 at any time. 　　Thank you! 　　Sinerely yours, 　　The Student Union 　　8） 海报结构公式 　　标题：活动主题或直接用poster 　　正文：第一段：概括引出活动，交代活动主办单位、活动的时间和地点。 　　第二段：阐述活动的主要目的和具体安排。 　　第三段：说明参加活动的条件和方式，交代联系或咨询方式，呼吁大家踊跃参与。 　　右下角：落款写主办单位名称。