Psychologists use a range of techniques to study the human mind and behavior, including naturalistic observation, experiments, case studies and questionnaires.

心理学家使用各种技术来研究人的思想和行为，包括自然观察，实验，个案研究及问卷调查。

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Psychologists use a range of techniques to study the human mind and behavior, including naturalistic observation, experiments, case studies and questionnaires.

心理学家使用各种技术来研究人的思想和行为，包括自然观察，实验，个案研究及问卷调查。

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