As cells from the blastocyst take in nourishment, another stage of development, the embryonic stage, begins.
随着囊胚中细胞不断地吸收营养成长，胚囊发育到另一个阶段：胚胎。
The kalala stage refers to the first week of embryonic development. The word "kalala" means "slippery coagulation, " a form coagulated like milk.
受胎后的第一个星期叫「羯罗蓝」，意思是「凝滑」，就是凝结成牛奶似的东西。
Up to now, human embryonic stem cells have been derived at a later stage of development when the embryo consists of about 150 cells.
到目前为止，人类胚胎干细胞都来自于发育比较晚的的阶段，那个时候胚胎大约有150个细胞。
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