下面我们将用到向回调发送参数的一种不同的方法；查看侧栏中关于两种方法之间区别的讨论。

We will encounter a different method for sending parameters to a callback below; check the Sidebar for a discussion of the differences between the two methods.

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Application Server提供一个框架，用于在消息的发送方一侧生成安全令牌，并在消息的接收方一侧验证这些安全令牌。

Application Server provides a framework to generate security tokens on the sender side of the message and to validate these security tokens on the receiver side of the message.

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发送的无线电信号含有冗余信息以便在接收侧进行纠错。

The transmitted radio signals comprise redundant information for allowing error correction at reception side.

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