The name comes from the term viviparity, which means giving birth to live young.

这个名字来自“胎”这个词，意思是诞新的命。

This is our best guess at what the first placental mammal looked like.

这是对第一种胎哺乳动物外貌的最好猜想了。

Instead, Dr O'Keefe believes he has discovered evidence that plesiosaurs, too, gave birth to live young.

反过来，奥基夫博士相信他已发现了蛇颈靠胎繁殖的证据。

Ichthyosaurs and other contemporary viviparous species, by contrast, gave birth to multiple offspring.

对比之下，鱼和其它现代胎物种可以育多个后代。

Especially in view of the embarrassing circumstance that his first-born was a girl and not a boy.

谁能想到他这个人怎么也不知羞耻地当众炫耀做父的光彩，何况头胎女儿，没有儿子，本不是什么光彩的事。

The discovery of the fossil makes researchers question the idea that these animals only gave birth to live young.

发现这颗化石使研究员开始质疑这些动物只能胎这一说法。

Almost all mammals give birth to live young instead of laying eggs, and all mammals feed their babies milk.

几乎所有的哺乳类都是胎，而不是卵，并且所有的哺乳类都乳喂养它们的孩子。

He said the findings could be used in the study of other sharks, including those that give birth to live young.

他说这些发现也可以于其他鲨鱼的研究，包括那些胎鲨鱼。

Like freshwater coral reefs, or birds that give birth to live young.

就像淡水珊瑚礁，或是那些胎的鸟类。

Giving birth to live young, called viviparity, is a pretty sweet evolutionary strategy.

胎，也就是直接出活的幼崽，是一种相当不错的进化策略。

And I was talking before about how sharks give birth to live young.

我之前提到过鲨鱼是胎的。

But they're not the only insects that give live birth.

但它们并不是唯一胎的昆虫。

Maybe because of some genetic reason that prevented viviparity.

也许是因为某些遗传原因阻止了胎。

So whatever’s stopping birds and crocodiles from giving birth to live young didn’t stop their earliest relatives.

所以无论是什么原因阻止鸟类和鳄鱼进行胎，都没有阻止它们最早的亲缘物种。

So they're only truly viviparous cockroaches.

因此，它们才是真正的卵胎蟑螂。

And what made it worse was that, instead of tactfully ignoring it, Bernard proceeded to make open comments on this revoltingly viviparous scene.

更糟糕的是，伯纳对这令人作呕的胎场面不但不是巧妙地置之不理，反倒公开发表起了意见。

Any theories, any hypotheses on why Pacific beetle cockroaches might be giving live birth as opposed to all the other cockroaches doing it differently?

关于太平洋卵盾蟑螂为何选择胎，而其他蟑螂种类却采取不的繁殖方式，有什么理论或假设吗？

The one big thing that it's worth mentioning is live birth has actually evolved more times in the insect systems than it actually has in the vertebrate systems.

值得特别指出的是，昆虫中胎现象的演化次数实际上比脊椎动物还要多。

The cori, something between a rat and a rabbit, and supposed by Mr Buffon to be the same with the aperea of Brazil, was the largest viviparous quadruped in St. Domingo.

科里，一种介于老鼠和兔子之间的东西，被布冯先认为与巴西的 aperea 相，是圣多明各最大的胎四足动物。

Had it survived to birth it would have been about 1.8 metres in length, and about one and a half times as heavy (relative to parental weight) as the offspring of other viviparous species of the time.

如真能够成功分娩，幼蛇颈的身长可能为1.8米左右，体重大约是时期其它胎物种后代的1.5倍（相对于父的重量）。