另外，多数行政法领域的标准教材都主要涉及联邦制度。

Moreover, most of the standard teaching materials in the field deal primarily with the federal system.

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这部字典在全国的课堂上成为标准教材，在随后的一个世纪里售出6000万册。

It would become a standard text in classrooms around the country, selling 60m copies over the course of the next century.

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其中几本教材中有很少的篇幅涉及到确认和验证，但是仅仅是简单的引用IEEE标准或其他正式的方法。

Some have short sections on validation and verification, but those simply point either to IEEE standards or other formal methods.

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