Objective To understand the relationship between betel nut chewing and the prevalence of oral submucous fibrosis(OSF)in Changsha area.是什么意思_Objective To understand the relationship between betel nut chewing and the prevalence of oral submucous fibrosis(OSF)in Changsha area.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句