send a message back meaning in English

发回信息

Unfortunately , there was no way to send a message back to america
不幸的是我们无法把消息发回美国。
If the message s receiver needs to send a message back to the endpoint that sent the message , then it should use this epr
如果消息接收方需要向发送消息的端点发送回消息，那么它应该使用这个端点引用（ epr ）。
If alice wants to send a message back to bob , she asks bob for his public key and encrypts her message using that public key
如果小红想要将消息发送回小明，她将向小明索要他的公钥并使用该公钥加密她的消息。
In the following example , we will walk through a script that sends a message back and forth between two tasks spawned by gridshell
在下面这个例子中，我们将详细介绍一个脚本，它的功能是在gridshell所派生的两个任务之间来回发送消息。