这个词是什么意思？
The hard portion of the tooth surrounding the pulp, covered by enamel on the crown and cementum on the root, which is harder and denser than bone but softer than enamel, and is thus readily abraded when left unprotected. (From Jablonski, Dictionary of Dentistry, 1992)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D003804 · MeSH 2026。
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