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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阐述了采用电流变换器的必要性，并详细地推导了电流变换器变流比的计算方法。

This article represented the necessity of applying current converter and deduced in detail the calculation method of current converter's transformer ratio.

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在相同叶轮出口速度下，叶片扩压器比无叶扩压器中气流速度下降迅速，叶轮出口处平均流场趋于均匀。

Under the same impeller outlet speed, the flow speed of blade diffuser is faster than the vaneless one. The average flow field at impeller outlet trends to uniform.

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