adj. viviparous
凡禽鸟都是卵生，而它却是胎生的。
Every birds bird is oviparous, and it is viviparity however.
相比之下，鱼龙和其他现代胎生的物种产下多个幼崽。
Ichthyosaurs and other contemporary viviparous species, by contrast, gave birth to multiple offspring.
一项新研究发现，近半数美国人希望头一胎生的是男孩。
Almost half of Americans want their first child to be a boy, according to a new study.
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