- 正式: formal; official; regular
- 邀请: invite
- 正式的邀请信: formal lnvitation letter
- 非正式的邀请信: informal invitation letter
- 邀请: invite 发出邀请 send an invitation; 应某人邀请 at the invitation of sb.; 邀请代表团来中国访问 invite the delegation to visit china; 邀请国 host country; 邀请赛 [体育] invitational tournament; 邀请书 invitation; 邀请者 inviter
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