用英语写一封邀请函邀请人：王洪伟,销售副总裁被邀请人：地区销售经理 事由：召开新产品市场调查分析研讨会 主要内容：研讨新

Dear Regional Sales Managers：
The purpose of this letter is to formally invite you, on behalf of the Board of Directors, to take part in the forthcoming new product market survey analysis seminar.
The theme of this seminar is "Discussion of the new product sales patterns and sales methods under the new situation". It will be held at the Li Jiang Hotel, on January 5, 2008.
This seminar is very important so please be on time. Thank you for your cooperation!
Yours sincerely,
Wang Hongwei
Vice President of Sales