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.
但不要假定这些实用程序可以替代数据库分析师。
But do not assume that these utilities substitute for database analysts.
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