Two times epidemiological investigation were made to acquire the rules and characters of the incidence and morbidity of rickets and the epidemical factors of rickets in spring and autumn 1987 in Dali county.是什么意思_Two times epidemiological investigation were made to acquire the rules and characters of the incidence and morbidity of rickets and the epidemical factors of rickets in spring and autumn 1987 in Dali county.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句