最后是垫片播出，在直播现场有异常情况的时候，用事先准备好的内容替换录入的现场信号播出，保持播出的连续性。
The last, it is the replacing broadcasting. When an emergency condition happens, it can be replaced by the program that we have prepared and the continuity of TV program can be maintained.
最后是垫片播出，在直播现场有异常情况的时候，用事先准备好的内容替换录入的现场信号播出，保持播出的连续性。
The last, it is the replacing broadcasting. When an emergency condition happens, it can be replaced by the program that we have prepared and the continuity of TV program can be maintained.
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