何谓体外授精与胚胎移植?
从妇女体内取出卵子,在体外培养一段时间与精子受精后,待发育成早期胚泡(8~16个细胞)时,再移植到妇女宫腔内使其着床并发育成胎儿的过程,称体外授精与胚胎移植,习称为试管婴儿。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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