And what's amazing about that is we can trace that fish to amphibians to reptiles to primates, all the way to us.

而且最神奇的是根据相关性追溯到这鱼类与栖类，爬行类再到灵长类动之间的联系，所有与我们人类之间有着联系。

He hypothesized that it started with a cone-like tooth, as we see in many fishes, amphibians, and reptiles.

他推测牙齿起初都呈尖状，正如我们在鱼类、栖类与爬行类动中所见到的那样。

It grows up to a meter and a half long, making it the world's largest amphibian.

成年体长1~1'5米，这使它成为世界上最大的栖类动。

Most reptiles lay eggs, but they are very different from the eggs of amphibians or fish.

大多数爬行类产蛋，但它们与鱼类和栖类的卵大有不同。

When the eggs hatch, the young may not look much like their parents, because some amphibians must go through metamorphosis—or a big change—to become adults.

当卵孵化时，幼仔可能看着不是很像它们的双亲，因为栖类动必须经历变形——或者是大变化——才变为成体。

You can tell if an animal is a reptile instead of an amphibian if it has dry, scaly skin.

你能判断出如果种动是爬行类而不是栖类，它会有干燥、有鳞片的皮肤。

Amphibians lay their delicate, jelly-covered eggs in the water.

栖类会在水中产下脆弱且有胶状包裹的卵。

Unlike our amphibian cousins, most mammals can't grow something like a limb on demand.

与我们的栖类亲戚不同，大多数哺乳动不能按需生长出类似四肢的东西。

In my lifetime, the number of birds, amphibians, reptiles and mammals has halved.

在我生中，鸟类、栖类、爬行动和哺乳动的数量减少了半。

Not only this one, to amphipods to the rainbow smelt to chinook salmon, which I think were actually introduced into Lake Ontario.

不仅限于此， 从栖类到彩虹胡瓜鱼， 再到大西洋鲑，后者我认为实际上是被引入安大略湖的。

Some other vertebrates, for example, amphibians, will have the capacity to produce new hair cells through the lifespan.

其他脊椎动，例如栖类，能够在整个生命周期内产生新的毛细胞。

Sentence 81 In contrast to mammals and birds, amphibians are unable to produce thermal energy through their metabolic activity, which would allow them to regulate their body temperature independent of the surounding or ambient temperature.

与哺乳动和鸟类相反，栖类动不能通过它们的代谢活动产生热能，这使得它们可以脱离周围的环境温度来调节体温。

The North American Amphibian Monitoring Program is the country's largest frog-counting system. Volunteers listen for frogs, identify the species, and give population estimates. They've been doing this for over a decade.

北美栖类监测计划是美国最大的青蛙计数系统。志愿者们倾听蛙鸣，鉴定其品种，并作出数量估算。十多年来，他们都是这么做的。