Dear__________,

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

It is necessary for us to________.On the onehand,__________.On the otherhand,_________.Hesce, it is hightime________.Firstly, we should_____________.Secondly,___________.

Please contact us via_________.Please join us inthe effort to __________.

Thank you for your paiticipation~

Sincerely,

____________