Method Based on the toltal number 87 maternal death from Jan. 1th 1990 to Dec 31th 1992 at 4 MCH project countides in Hebei, face to face inquiry method is used to process retrospective epidemiological investigation.是什么意思_Method Based on the toltal number 87 maternal death from Jan. 1th 1990 to Dec 31th 1992 at 4 MCH project countides in Hebei, face to face inquiry method is used to process retrospective epidemiological investigation.在线翻译_英语_读音_用法_例句