这些囊胚细胞, 称卵裂球, 每个细胞都有一套二倍体染色体组.The cells of the blastula , called blastomeres, also each receive a full diploid set of chromosomes.桑椹胚形成于''.'囊'.''胚之前且处于胚胎''.'期'. '�...
...a small blue sign with white lettering.一块蓝底白字的小招牌The book’s cover has white lettering on a blue background.本书封面为蓝底白字。The book's cover has white lettering on a blue background.本书封面为蓝底白字.The lettering on the graves...