下列阶段往往不会按顺序先后发生，而是重复交叉。

These stages often do not follow in sequence, and commonly repeat and overlap.

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在很多情况下，“民办教育”、“民办学校”是交叉复合的概念，在我国不同历史阶段有不同含义。

Under many circumstances "nongovernmental education" and "nongovernmental schools" are intersecting and complex concepts, with different implications at different historical stages in China.

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结论：现行的交叉试验的秩和检验无法比较阶段间的差别，应予以改进。

Condusion: The current method of Rank sun test for comparing different phases in cross-over trial should be improved.

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