| 单词 | 牙科学 |
| 释义 | 〔odontology〕The study of the structure, development, and abnormalities of the teeth.牙科学：对于牙齿构造、生长及畸形的研究〔exodontics〕The dental specialty that deals with extraction of teeth.拔牙学：研究牙的拔除的牙科学〔gerodontics〕The branch of dentistry that deals with the diagnosis, prevention, and treatment of diseases and problems specific to the aged.老年牙医学：牙科学分支，专门研究老年人牙病和问题的诊断、预防和治疗〔platinum〕Symbol Pt A silver-white metallic element occurring worldwide, usually mixed with other metals such as iridium, osmium, or nickel. It is ductile and malleable, does not oxidize in air, and is used as a catalyst and in electrical components, jewelry, dentistry, and electroplating. Atomic number 78; atomic weight 195.09; melting point 1,772°C; boiling point 3,827°C; specific gravity 21.45; valence 2, 3, 4. See table at element 符号 Pt 铂：一种世界范围内存在的银白色金属元素，常与其它金属，如铱、锇或镍混合，易拉长且具延展性的，在空气中不氧化，可用作催化剂，用于电学元件、珠宝，牙科学和电镀中。原子序数78；原子量195.09；熔点1,772°C；沸点3,827°C；比重21.45；化合价2,3,4 参见 element |
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