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Dear Professor Smith,

I am writing to sincerely apologize for having to cancel our scheduled meeting. Unfortunately, an urgent family matter requires my immediate attention, making it impossible for me to travel next week. I truly regret any inconvenience this may cause.

I remain very interested in discussing my research with you. Would it be possible to arrange an online meeting sometime next month? Please let me know what time would be convenient for you.

Thank you for your understanding.

Yours sincerely,
Li Ming

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