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。
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。
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.
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