诸如此类对双胞胎的研究点明了行径的方向，然而他们仅提供了运行的表面解释。
Twin studies such as these point the way, but they provide only superficial explanations of what is going on.
绪论部分主要点明了本课题的研究现状，继而明确本课题今后的努力方向以及研究意义。
The part of the introduction mainly points out the current research situation of the subject, and analyses the striving direction and research meaning in the future.
绪论部分主要点明了本课题的研究现状，继而明确本课题今后的努力方向以及研究意义。
The part of the introduction mainly points out the current research situation of the subject, and analyses the striving direction and research meaning in the future.
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