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1·Sharks display three ways to bear their young, varying by species, oviparity, viviparity and ovoviviparity.

鲨鱼有三种繁殖方式，它们的繁殖方式因物种而异，分别是卵胎生、胎生和卵胎生。

2·Every birds bird is oviparous, and it is viviparity however.

凡禽鸟都是卵生，而它却是胎生的。

3·Viviparity has evolved about a hundred times in reptiles, said herpetologist Rick Shine of the University of Sydney in Australia.

澳大利亚悉尼大学的爬虫学者瑞克.谢利（Rick Shine）说，“胎生在爬虫类动物中有了成百倍的进化，所以它们不再多产也很正常。

4·The gestation of demand cone of broad sense is led by technological innovation. That is that continuous viviparity is promoted technological innovation.

广义需求圆锥体的大中生小的孕育是由技术创新导致的，亦即其不断的“胎生”是由技术创新推动的。

胎生

1·Sharks display three ways to bear their young, varying by species, oviparity, viviparity and ovoviviparity.

鲨鱼有三种繁殖方式，它们的繁殖方式因物种而异，分别是卵胎生、胎生和卵胎生。

2·The gestation of demand cone of broad sense is led by technological innovation. That is that continuous viviparity is promoted technological innovation.

广义需求圆锥体的大中生小的孕育是由技术创新导致的，亦即其不断的“胎生”是由技术创新推动的。