the internal validity criteria should be used to define methodological quality in the meta-analysis.
meta分析中应采用这些评价研究内部真实性的标準来评估研究的方法学质量。
right assignment is relates to the debtor「s and the third party」s interests, so after has the internal validity between contract parties, it also should has the external interests.
债权让与涉及让与合同外的债务人和第三人利益,因此其在让与双方间生效后存在一个对外效力问题。
the fundamental difficulty with xml documents is checking their internal validity (cohesion of document logic).
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)。
internal validity concerns the only explanation of the results, and the external validity concerns the generalizability of the results.