从人胚胎生殖嵴、肠系膜中消化分离的原始生殖细胞，将其接种在人子宫内膜成纤维细胞饲养层上传代培养。
PGC from genital ridge and mesenterium of human embryo was incubated on fibroblast feeder layers for subculture.
最原始的羽毛是单纤维，类似于刚毛，从爬行动物的皮肤上突出来。
Feathers in their most primitive form were single filaments, resembling quills, that jutted from reptilian skin.
进行碳纤维生产的宝马正采用最原始的方法解决这个问题。
BMW, with its carbon fiber constructions, is taking the most original approach to the problem.
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