It's this group of cells, this subset of cells from the developing embryo that become the embryo, that become the organism, become the human.

这一组细胞,这组发育胚胎中的细胞亚群,发育成胚胎,发育组织,直至发育成整个人体

耶鲁公开课 - 生物医学工程探索课程节选

you get a good number of people who like to do sororities and frats and stuff.

也有部分人数喜欢组姐妹群、兄弟会这一类的组织。

学习和交际都重要 - SpeakingMax英语口语达人