顺序是这样的，当RAM很昂贵时SGML（Standard Generalized Markup Language 标准通用标记语言）出现了，因为文件总是比物理RAM存储器大很多，所以它必需是流处理方式：内存中处理的价格高的惊人。
Here is the sequence: SGML comes out when RAM is expensive, and it must be stream processed since documents are so much bigger than physical RAM: in-memory implementations are prohibitive.
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