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

两栖类会在水中产下脆弱且有胶状物包裹的卵。

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，这使它成为世界的两栖类动物。

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、两栖类与爬行类动物中所见到的那样。

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

你能判断出如果一种动物是爬行类而不是两栖类，它会有干燥、有片的皮肤。

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

多数爬行类产蛋，但它们与鱼类和两栖类的卵有不同。

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

与我们的两栖类亲戚不同，多数哺乳动物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.

在我一生中，鸟类、两栖类、爬行动物和哺乳动物的数量减少了一半。

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

而且神奇的是根据相关性追溯到这些鱼类与两栖类，爬行类再到灵长类动物之间的联系，所有与我们人类之间有着联系。

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

一些其他脊椎动物，例如两栖类，能够在整个生命周期内产生新的毛细胞。

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，因为一些两栖类动物必须经历变形——或者是变化——才变为成体。

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， 从两栖类到彩虹胡瓜鱼， 再到西洋鲑，后者我认为实际是被引入安略湖的。

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.

北美两栖类监测计划是美国的青蛙计数系统。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。

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.

与哺乳动物和鸟类相反，两栖类动物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。