用英语给外国友人写一封信，呼吁他们帮忙四川地震灾区的朋友们，如何写啊？？

Dear Sir or Madam,
On May 12,2008, a killer earthquake hit Wenchuan, Sichuan province,bringing about large quantities of damage and taking more than 60,000 lives away for ever. After the quake, all the chinese people got together and fought against the catastrophe at all costs. Countless soldiers, doctors and volunteers were engaged in finding the people trapped in the ruins and saved them. I believe all the world would be moved by brave Chinese people. But the disaster is so strong that millions of people become homeless for their houses have been destroyed and they need our help. So I wrote the letter to you and wish you, my dear friend, could do something to help those homeless people. I believe with your help , we can defeat the disaster sooner.
I look forward to hearing from you!
Your sincerely
LiHua