题目内容：

假定你是李华，从网上获悉某国际青少年志愿者组织正在全球招募暑假志愿者。请用英语写一封100词左右的电子邮件申请参加。

主要内容如下：

1. 写信目的； 2.自我介绍； 3.希望获准。

Dear Sir or Madam,

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Yours sincerely,

Li Hua