目的探讨与早期自然流产相关的环境危险因素，为降低自然流产率、减少不良妊娠结局的发生提供参考。
Objective:Explore the environmental risk factors of early spontaneous abortion, so as to reduce the percent of miscarriage and Occurrence of adverse pregnancy outcome.
研究同时显示，怀孕早期每日服用维生素补品的妇女流产率比不服用维生素补品的低50%。
Research also shows that, early pregnancy taking daily vitamin supplements abortion rate than women who don't take vitamin supplements to low 50%.
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