名词
中文翻译：邀请函
同义词：
['invitation', 'invitation letter']
例句：
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1. Theinvitation was sent out to all the guestsat the party.
邀请函已经发送给所有参加派对的客人。
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2. Shereceived an invitation to speakat the conference.
她收到了在会议上发言的邀请。
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3. Theinvitational paper is aformal document that requests someone toattend an event.
邀请函是一种正式的文件，要求某人参加某个活动。