In recent years, many researches on unexplained recurrent spontaneous abortion revealed that URSA is mainly related to immunological factors.
近几年研究表明，不明原因反复自然流产主要与免疫因素有关。
In recent years, many researches on unexplained recurrent spontaneous abortion revealed that URSA is mainly related to immunological factors.
近几年研究表明，不明原因反复自然流产主要与免疫因素有关。
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