这一概念的流变趋势，是与行政实践密不可分的。

So the concept of administrative law is not a unified one .

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在分配举证责任方面，行政实践通常遵循司法模式。

Administrative practice generally follows the judicial model in allocating burdens of proof.

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本书的主要焦点是联邦行政机关，但也包括一些关于州的行政实践的讨论。

The primary focus of this text is on federal administrative agencies, although some discussions of state administrative practice are included.

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