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.
成因找出及修正之后，下次你再收到同样错误的时候便会收到更新信息连同解决此问题的指导方法。
After a cause has been found and corrected you will receive an updated message the next time you receive this same error with instructions on resolving the problem.
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