答：神经障碍系中枢神经系统和周围神经系统疾病。
A: Neurological disorders are diseases of the central and peripheral nervous system.
以无脑儿作为天然实验材料，观察胎儿脑腺发生与中枢神经系的关系。
Anencephalus was used as a natural experimental model for studying the relation between the development of thymus and the central nervous system.
以无脑儿作为天然实验材料，观察胎儿脑腺发生与中枢神经系的关系。
Anencephalus was used as a natural experimental model for studying the relation between the development of thymus and the central nervous system.
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