Reliable messaging refers to the ability of a sender to deliver a message once and only once to its intended receiver.

可靠的消息传递是指发送方向它所期望的接受方传递一次并且只传递一次消息的能力。

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If a FWD element that contains one or more via elements is present, the receiver should remove and inspect the top via subelement of FWD and verify that it is the intended recipient of the message.

如果出现了包含一个或多个via元素的fwd元素，接收方应该删除并检查fwd元素的第一个via子元素，并验证它是不是消息意想中的接收方。

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More commonly, though, a broadcast receiver is just a "gateway" to other components and is intended to do a very minimal amount of work.

但是，更常见的情况是，broadcast receiver只作为其他组件的“出入口”(gateway)，其本身做的工作非常少。

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However, if there is a lot of noise (interference) on the channel the receiver is listening to, it cannot detect the intended signal because it is covered by noise.

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