This paper is an experimental study on the external validity of HSK.

本文是关于HSK外部效度的一次实证性研究。

The external validity is distinguished as validity to the debtor and validity to the third party.

债权让与的对外效力分为对债务人的效力与对其他第三人的效力。

The researchers also should reduce the influence of irrelevant variables in measurement to guarantee the external validity of processing.

控制具体测量过程中的无关变量的影响，保证统计处理的外部效度。

With an unproven external validity, the author suggests a cautious application of this research when translated to the general field of college-choice behavior.

由于本研究的外部效度仍待验证，因此对本研究结论的外推应尤其谨慎。

The single subject research is one of the useful methods in the research of special children's psychology and education, but its external validity often receives challenges.

单一被试实验是特殊儿童心理与教育研究中的一种常用方法，但其外部效度往往受到质疑。