假如你是李华，是红光中学的校学生会主席。最近你校林艳同学的父亲被查出患白血病，治疗需要花大笔费用。但她家较贫困，林艳也面临缀学。现请你写一封倡议书，号召全体同学伸出援助之手，帮助林艳同学的家庭渡过难关。
注意：
1.词数：120左右，可适当增加细节以使行文连贯
2.倡议书的开头已为你写好，不计入总词数
3.参考词汇：白血病 n.leukemia  诊断 v. diagnose

One possible version：
Dear fellow students,
    As we all know, Lin Yan is a very excellent student in our school. She studies very hard and has been highly thought of by her teachers. Unfortunately, recently her father has been diagnosed with leukemia. As far as I’m concerned, it cost too much to recover himself from such a serious disease. What’s worse, her family isn’t a rich one. If too much money has been spent on cure, there’s no doubt that Lin Yan will be forced to draw out of school.
    As chairman of the Students’ Union, I’ll spare no efforts to give Lin Yan a hand and donate some money to her. Here I also call on all of us to do the same to her. I just hope that our limited effort will make a difference to her family in need.