| 词汇 | blastocyst |
| 释义 | blastocyst noun [ C ] biology specialized uk/ˈblæs.tə.sɪst/ us/ˈblæs.tə.sɪst/ 囊胚 a blastula (= the early stage of development, consisting of a layer of cells around an empty space) of the embryo of a mammal Five to six days after an egg is fertilized by a sperm, a tiny ball of cells develops called a blastocyst. 卵子被精子受精五到六天后，会发育出一个小细胞球，称为囊胚。 The blastocyst cannot support life without being attached to the wall of a uterus. Related word: blastula
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