邀请函的英文怎么说

邀请函的英文：
invitation

• 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。

• 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。