non-priority meaning in English

非优先性

Postal services - quality of service - measurement of the transit time of end - to - end services for single piece non - priority mail and second class mail
邮政服务.服务质量.单件非优先邮件和二级邮件全程服务运送时间的测量
Postal services - quality of service - measurement of the transit time of end - to - end services for single piece non - priority mail and first class mail
邮政服务.服务质量.单件非优先邮件和第一级邮件的终端局间邮政服务转接时间的测量
Postal services - quality of services - measurement of the transit time of end - to - end services for single piece non - priority mail and second class mail ; german version en 14508 : 2003
邮政服务.服务质量.单件非优先邮件和二级邮件全程服