the epidemic characteristics of dental caries第六: sixth章: chapter; verse; section的: 4次方是 The fourth power of 2 i ...流行病: epidemic; epidemic disease学: study; learn下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:第六章 龋的流行病学特征，即可在微信中查询翻译
