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The standard only defined the decoding model, then the multiplex designing was very free, because it was demonstrated good if the output of it could be decoded by the MPEG-2 decoder.
这个标准中只定义解码模型，因此编码端的复用器的设计有很大的自由度，只要能够被MPEG-2解码器所解码就符合要求。
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