by return
美 
英 
- na.请即回示
 - 网络立即回信;由送信人捎回;藉由这封信的回应
 
un.  | 1. by the next post back to the sender 2. if you reply to a letter by return of post, you write back to the person who wrote to you, immediately after you have received their letter  | 
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