What's different about this modeling approach than those that have come before - and, for that matter, why did it take until now?
这个建模方法和以前那些有什么不同，为什么现在才出现？
This approach represents the next level of rigor in modeling.
此方法表现出建模中的下一个精确级别。
This section introduces the two-tiered warehouse modeling approach, which is the best fit for a bottom-up implementation.
本小节将介绍两层的仓库建模方法，该方法最适合于自底向上的实现。
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