如果队列中有响应消息，则服务提供者将此消息返回给请求者。
If the response has been queued, the Provider returns that response back to the requester.
消息传递系统确定哪一个提供者能够接收消息，并确保只有一个提供者接收消息。
The messaging system determines which provider is able to receive the message and ensures that only one provider receives the message.
有了JMS，消息传递客户机可以通过提供者发送消息，消息发送出去之后便可以离线，而让提供者从容地传送这条消息。
With JMS, messaging clients can send messages via the provider and then go offline, leaving the provider to transmit the message as time allows.
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