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些两栖，爬行再到灵长之间的联系，所有我们人之间有着联系。

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、两栖爬行中所见到的那样。

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两栖。

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

大多数爬行产蛋，但它们和两栖的卵大有不同。

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，因为些两栖必须经历变形——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.

你能判断出如果是爬行而不是两栖，它会有干燥、有鳞片的皮肤。

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

两栖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.

我们的两栖亲戚不同，大多数哺乳不能按需生长出似四肢的东西。

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

在我生中，鸟、两栖、爬行和哺乳的数量减少了半。

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， 从两栖到彩虹胡瓜， 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.

些其他脊椎，例如两栖，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.

哺乳和鸟相反，两栖不能通过它们的代谢活产生热能，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.

北美两栖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，并作出数量估算。十多年来，他们都是这么做的。