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Dear__________,

　　I am writing this letter to call on_________.As some of you may know,________.In face,________.

　　It is necessary for us to________.On the one hand,__________.On the other hand,_________.Hesce, it is high time________.Firstly, we should_____________.Secondly,___________.

　　Please contact us via_________.Please join us in the effort to __________.

Thank you for your paiticipation

Sincerely,

____________

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