orthodontics
orthodontics[ˌɔːθəˈdɒntɪks](亦作 orthodontia -ˈdɒntɪə)plural noun- [treated as sing.]the treatment of irregularities in the teeth and jaws
正牙学
派生orthodonticadjectiveorthodonticallyadverborthodontistnoun语源- early 20th cent.: from ortho- 'straight' + Greek odous, odont- 'tooth'
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