primary gonocyte英美初生性原细胞;初级生殖母细胞医学双语例句Primary Culture, Subculture and Biological Identification of Human Embryonic Germ Cells; secondary gonocyte人胚胎生殖细胞的原代、传代培养及生物学鉴定次级性原细胞,次级生殖母细胞