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Dear Professor Smith,

  I am writing this email to apologize for not being able to visit you as we previously planned.

  There has been a tragic accident today where I was hit by a car while crossing the street. Unfortunately, my leg was fractured and I was told at elast two months are required for my leg to recover and be able to walk again.

  I am sorry if such unforseen event had messed up your agenda. If possible, may I suggest scheduling another visit three months from now, after I have recovered? We can confirm the date later if you like.

Yours sincerely, 

Li Ming

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