英文邀请函格式如何写英文邀请函？其格式如何？本文介绍5种常见的英文邀请函予以参考：五种常见的英文邀请信之一
Dear sir/madam: I'm delighted that you have accepted our invitation to speak at the Conference in [city] on [date]. As we agreed, you'll be speaking on the topic... from [time] to [time]. There will be an additional minutes for questions. Would you please tell me what kind of audio-visual ..