纵向研究方法是心理学研究领域的一种重要方法。
Longitudinal method is one of the central topics in psychology.
方法：采用逐年取研究模型的纵向研究方法，追踪观察44例正常乳牙列儿童在3 ~ 5岁期间的牙列发育状况。
Methods: The growth of dentition of 44 children 3 ~ 5 years old with normal deciduous dentition was observed continually.
20多年以来，詹克一直在研究音乐课的效果，和舍伦贝格一样，他认为唯一能够真正了解其效果的方法就是进行纵向研究。
For over two decades, Jancke has researched the effects of music lessons, and like Schellenberg, he believes that the only way to truly understand their effects is to run longitudinal studies.
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