内部有效性——在条件变化的时候，其成因和结果还会是真实的么？

Internal validity - is there true cause and effect between variables.

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使用XML文档的主要困难在于检查其内部有效性(文档逻辑的内聚性)。

The fundamental difficulty with XML documents is checking their internal validity (cohesion of document logic).

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同时，基于内部稳定性，犯罪，法之有效性以及与其他国家的关系，调查也鉴定这些城市所拥有的最高人身安全指数。

The survey also identifies those cities with the highest personal safety ranking based on internal stability, crime, effectiveness of law enforcement, and relationships with other countries.

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