是通过比较同卵双生子之间和异卵双生子之间在心理发展特征上相似程度，来了解遗传和环境因素对这种心理发展特征的影响程度。
双生子研究方法 twin-study method
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双生子研究是确定复杂疾病和性状遗传学基础的重要方法之一。
Twin study is one of the most important methods to identify the genetic basis of complex diseases or traits.
开展双生子研究对中医基础理论和临床实践有极大的推动作用。
Carrying out the twin study can play a great role in prompting the basic theory and clinical practice of TCM.
对该病再发风险率以及双生子研究的结果提示，强直性脊柱炎的发病有很强的遗传倾向。
The sibling recurrence risk ratio and twin studies suggested that strong genetic factors are implicated in the etiology of the disease.
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