全书有上中下三篇共12个部分。
社会大致可以分为上中下三个不同的阶层。
Society can be divided into upper, middle and lower classes.
对天然气上中下游统筹考虑，是解决城市调峰最经济合理的途径。
The overall consideration for natural gas upstream, medium-stream and downstream is the most economic and rational way to solve the peak shaving in cities.
结合主煤仓上中下不同地段的特点，研究了不同的抗破坏技术和施工方法。
In combination with the top, meddle and bottom section features of the main coal silo, the paper studied the different anti failure technology and construction method.
通过不同燃料偏析程度的烧结杯试验，说明酒钢酸性球团烧结工艺在上中下三层的合理燃料偏析程度是0.4%。
Based on pot tests with different carbon profile in sinter-bed, it is found that suitable degree of carbon segregation in three-layer is 0.4%.
通过不同燃料偏析程度的烧结杯试验，说明酒钢酸性球团烧结工艺在上中下三层的合理燃料偏析程度是0.4%。
Based on pot tests with different carbon profile in sinter-bed, it is found that suitable degree of carbon segregation in three-layer is 0.4%.
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