1、Spontaneous abortion at earlier stages of pregnancy is called miscarriage.
流產(chǎn)可自然發(fā)生，稱自然流產(chǎn)。

2、Factors of early spontaneous abortion in IVF?ET.
IVF-ET中自然流產(chǎn)的相關因素分析

3、repeated spontaneous abortion (often for no known reason).
重復自然地流產(chǎn)（經(jīng)常沒有清楚的原因）。

4、It suggests that there is a relationship between spontaneous abortion and HPV B19 infection.
結論可能人細小病毒B19感染與自然流產(chǎn)有一定關聯(lián)。

spontaneous abortion翻譯