确认应答机为紧急。
请求可能已被传递并且已经在响应方成功处理完毕，但是作为确认的应答却仍在等待返回请求方的传递。
The request may have been delivered and processed successfully at the responder, but the reply confirming this is still waiting for delivery back to the requester.
俄罗斯国防部表示，俄罗斯方面是在美国飞机接近俄罗斯边界并关闭了确认身份的应答器之后才下令战斗机升空的。
The Russian defense ministry said it dispatched its fighter jet after the U. S. aircraft approached the Russian border and turned off its transponders, which are used for identification.
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