求翻译：牙齿是人体中最坚硬的器官，分为牙冠、牙颈和牙根三部分。又分为牙釉质（珐琅质）、牙本质（象牙质）、牙髓（神经腺）、牙冠、牙颈、牙根等是什么意思？

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teeth in the human body is the toughest of the organ, in crowns, teeth present and part 3. It is divided into tooth enamel (enamel) and essence (ivory teeth), bone marrow, Thymus gland (NEuro), crowns, neck, teeth, etc.

The tooth is in the human body the hardest organ, divides into the crown, the dental neck and the root of a tooth three parts.Also divides into the enamel of tooth (enamel), the tooth essence (dentine), the dental pulp (neural gland), the crown, the dental neck, the root of a tooth and so on

Teeth are the hardest organs of the body, divided into crowns, neck and teeth in three parts. Are divided into enamel (enamel) and dentin (ivory mass), pulp (nerve gland), crowns, neck, root resorption, etc

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