When publishing a message, mark this message for immediate processing by the broker. (High priority message.)
当发布消息时候，这个消息将被立即处理。
It indicates whether this is a high-priority message from the system that must be presented before all other messages-for example, that a key script has stopped functioning.
它指示这是否是一个高优先级消息，必须在所有其他消息之前进行展示——例如，一个关键脚本停止工作。
For example, a message tagged as high priority can be routed to its destination ahead of less important or low-priority messages or packets involved in casual Internet browsing.
例如，消息标记高优先级可以被路由到目的地之前那么重要或低优先级消息或包参与休闲的互联网浏览。
For example, a message tagged as high priority can be routed to its destination ahead of less important or low-priority messages or packets involved in casual Internet browsing.
例如，消息标记高优先级可以被路由到目的地之前那么重要或低优先级消息或包参与休闲的互联网浏览。
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