surface mail
noun /ˈsɜːfɪs meɪl/
  /ˈsɜːrfɪs meɪl/
[uncountable]- letters, etc. carried by road, railway or sea, not by air水陆路邮件;平寄邮件 
| 词汇 | surface mail | 
| 释义 | surface mailnoun /ˈsɜːfɪs meɪl/  /ˈsɜːrfɪs meɪl/[uncountable] 
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