Subsequent iterations further the building of sub-assemblies in reality or through models, depending upon the number of standard elements.

后面的迭代更加促进了构建子系统集成，是实际系统或模型则依赖于标准单元的个数。

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The system applies the conception of continuously tracing and standard sub-tree, and uses both synthesis and deduction method of FT building.

本系统应用了逐级上溯和标准化子树的概念，综合应用演绎法和合成法进行建树推理。

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