in vitro fertilization
柯林斯词典
1. N a technique enabling some women who are unable to conceive to bear children. Egg cells removed from a woman's ovary are fertilized by sperm in vitro; some of the resulting fertilized egg cells are incubated until the blastocyst stage, which are then implanted into her uterus 试管内授精; 体外授精 ( abbr: IVF)
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