When the message is dequeued again, the same condition occurs.
当该讯息再度从伫列移除时，相同情况还会发生。
Packets are enqueued for transmission and dequeued by the device driver.
数据包是由设备驱动进行入队传输和出队。
When the message is dequeued, typically by an MDB in J2EE, the original caller's identity is not available.
当消息离开队列时(在J2EE中通常由MDB将消息从队列取出)，原始调用方的标识将不可用。
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