Nearly a century ago, biologists found that if they separated an invertebrate animal embryo into two parts at an early stage of its life, it would survive and develop as two normal embryos.
近一个世纪前,生物学家发现,如果他们在无脊椎动物胚胎生命的早期阶段将其分成两部分,它会存活下来并发育成两个正常的胚胎。
This stage (阶段) of a butterfly's life is known as the "pupa" stage.
蝴蝶生命中的这一阶段被称为“蛹”。
Some of the sociologists, psychologists and demographers who study this new life stage see it as a good thing.
一些研究这一新的生活阶段的社会学家、心理学家和人口统计学家把这样现象看成是一件好事。
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