邀请函的英文：
invitation

参考例句：
  • Entry to this competition is by invitation only.
    此次竞赛的参赛只凭邀请函。
  • Nobody in the office had received an invitation to the party.
    在办公室里没有人收到邀请函去参加这个宴会。
invitation是什么意思：
n. 邀请；请柬；引诱
  • Whomever you invite will be welcome.
    你邀请的任何人都将受欢迎。
  • He was upset at not being invited.
    人家没邀请他，他很不痛快.
  • A Bad padlock invites a picklock
    坏锁招人撬
  • Entry to this competition is by invitation only.
    此次竞赛的参赛只凭邀请函。
  • She was favored with an invitation.
    她受到了邀请。

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