corroborator

例句：

1. 1.The courier delivered the package to the post office.
   信使将包裹送到邮局。
2. 2.The messenger brought the news to the king.
   信使将消息带给了国王。
3. 3.The courier was late for the delivery due to a heavy rain.
   由于大雨，信使的送货迟到了。