为了压缩数据，LZ 77算法使用对匹配数据的引用来取代数据部分。匹配数据已经通过编码器和解码器传递。

To compress data, the LZ77 algorithm replaces portions of the data with references to matching data that has already passed through both the encoder and the decoder.

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只要预测到符号是独特的，就不需要对其进行编码，因为解码器从DTD生成相同的模型，从而可以生成独特的预期符号。

Whenever the predicted symbol is unique, there is no need to encode it as the decoder generates the same model from the DTD and thus can generate the unique expected symbol.

youdao

如果开始出现的是 0 ，那么这个规则需要改变，但效果是一样的，因为编码器和解码器都遵循这一规则。

This rule can be inverted to store a 0 if the run begins with a 0 bit, but the effect is the same as long as both the encoder and the decoder of the inversion list agree on this detail.

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