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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
    更多例句
  • Embryonic stem cells are taken from a blastocyst - a ball of cells that develops within a few days after an egg has been fertilized by a sperm.
  • There are ethical issues raised by these treatments, such as the disposal of healthy blastocysts.
  • The study concerned the production of viable bovine blastocysts in vitro.
  • They looked at the effect of maternal age on early human embryonic development and blastocyst formation.
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