这一封回复客户的邮件中,主要在什么情况下使用?( ) Dear Buyer, We are sorry to tell you that your package is more than 2kg.China post air mail can only ship the package below 2kg. So please kindly choose another express carrier, such as ups or dhI which will cost you some shipping fee. Please kindly tell us your option. If you have any further question, please feel free to tell us. Best regards.