多年来，妇产医学界认为胚胎缺陷或诸如凝血异常、反常的免疫响应是流产的基本原因。

For years, faulty embryos or problems such as abnormal clotting or immune responses have been blamed.

youdao

多年来，妇产医学界认为胚胎缺陷或诸如凝血异常、反常的免疫响应是流产的基本原因。

For years, faulty embryos or problems such as abnormal clotting or immune responses have been blamed.

youdao