他认为，牙冠和牙根有很多的遗传成分，受环境和其他因素的影响很小。
He argues that tooth crowns and roots have a high genetic component, minimally affected by environmental and other factors.
这种遗传成分要与AUDs患者和他们的家庭成员交流。
This genetic component should be communicated to patients with AUDs and to their family members.
如果不考虑外伤，所有影响神经系统的疾病都有遗传成分。
With the possible exception of trauma, every disease that affects the nervous system has some inherited component.
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