reply_to_an_invitation_有道手机词典

1.If you want people to reply to an invitation, put (RSVP) at the bottom.
如果想让人回复邀请函，就要在邀请函底下注明尽快回复字样(RSVP)。
dict.yoduao.com
2.For example, if you send me an invitation to speak at a conference and I ask what the topic is, you might reply with just the topic, snipping out all the details of the conference.
举个例子，如果你给我发送一封邮件，邀请我在一个会议上发言，我问发言的主题是什么，你可能只回复我这个主题，剪去了所有关于这个会议的细节。
dict.yoduao.com
3.An invitation is a courtesy and must be promptly acknowledged. Whether a reply is called for or not, one must advise either an acceptance or refusal. A host should know how many guests to expect.
不论答复是接受还是拒绝，邀请都必须立即确认，以便主人了解所需接待客人的人数。
dict.yoduao.com