信差的英文：
messenger

I sent the letter by a messenger.
我差信差送信。

The messenger delivered him a letter.
信差交给他一封信。

The letter was delivered by a courier this morning.
送递急件的信差今天早晨送来了这封信。

Sir George Staunton instantly wrote back an answer, rewarding the messenger liberally
乔治?斯汤顿爵士立即写了回信，慷慨地犒赏了信差。

express messenger
专差

pass a messenger
传递引绳

He sent the package by special messenger or by motorcycle messenger.
他用特殊的信使或用摩托信使发送包裹。

He sent the package by special messenger or by motorcycle messenger .
他让一个摩托信使送这包裹。

Recall your messenger.
召回你的使者。