背的一篇，不是自己写的，为了观感，下文每一句都隔开。
Dear Mr.smith
第一句 On behalf of the student's Union , I am sending this email to you to act as our judge for English speech contest to be held in our university on june 5.
第二句 To be morn specific,the contest is on the topic of how to embrace tough challenges in this digital era.
第三句 In this competition, ten participants will deliver their speeches with respect to this topic.
第四句 It's widely acknowledged that you are a top expert in this fild, so we sincerely hope that you can accept invitation.
第五句 For forether information, please contact me without hesitation, and we are looking forward to your reply and arrival.
Yours respectfully
Li Ming
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