北京仟彩大率现代远程教育 l.Cultural background(文化背景) How to write::如何写邀请函 l.Greeting开头打招呼语： Dear/Dear all; Mr./Ms./Mrs.; Prof.; All faculties; Hello！Everyone; To whom it may concernI. Cultural background (文化背景) How to write：如何写邀请函 1.Greeting 开头打招呼语： Dear/Dear all; Mr./ Ms./Mrs.; Prof.; All faculties; Hello! Everyone; To whom it may concern