Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.

尽管白垩纪时期小行星灭绝了居统治地位恐龙，但哺乳动物却一直到1000万年后始新世才真正兴起繁盛起来。

So given its size, it was able to support many different ecosystems in the Eocene.

所考虑到它大小，它能够支持 始新世许多不态系统。

Other residents of Eocene Antarctica probably came from South America as well.

始新世南极洲其他居民可能 也来自南美洲。

These were small, nimble carnivores that were adapted to the warm, forested world of the Late Eocene.

这些是适应了晚始新世温暖森林世界体型较小、动作敏食肉动物。

And a big environmental change was also underway in the last half of the Eocene, thanks to the chemistry of mountain-building.

而在始新世后半期，由于造山运动化学作用，也发了一场巨大环境变化。

Or there's the Eocene, more than 34 million years ago, a hothouse time during which the continents drifted into their present configuration.

或者我们可到3400多万年前始新世，那是一个全球变暖时代， 各大陆漂移至现今布局。

Scientists think beavers originally evolved in North America toward the end of the Eocene Epoch, with the earliest known species scampering around Wyoming 35 million years ago.

科学家认为海狸最初在北美始新世末期进化，已知最早物种大约在3500万年前在怀俄明州活动。

Back at the start of the Eocene Epoch, the world was in the clutches of the Paleocene-Eocene Thermal Maximum, and warm, damp forests covered the land from pole to pole.

在始新世初期，地球正处于古新世-始新世极热事件控制下，温暖潮湿森林从北极到南极覆盖了整个陆地。

From their early, possibly-tree-climbing origins in the Late Eocene or Early Oligocene, they diversified and expanded with the spread of grasslands in the Miocene, taking advantage of new predatory niches.

从它们起源于晚始新世或早渐新世早期（可能是爬树）开始，它们随着中新世草原扩张而多样化和扩张，利用新掠食性态位。

Filling  ecological niches once occupied by dinosaurs, mammals came to dominate the dry grasslands and  forests of the Eocene and beyond, but no species may have been more threatening than humankind.

哺乳动物填补了曾经被恐龙占据态位，并开始主宰始新世及后干燥草原和森林，但没有任何物种比人类更具威胁性。

Were the beautiful volute and cone shells of the Eocene epoch, and the gracefully sculptured ammonites of the Secondary period, created that man might ages afterwards admire them in his cabinet?

始新世美丽蜗壳和锥壳， 及第二时期雕刻精美菊石， 是为了让人们在后岁月里在他橱柜里欣赏它们而创造吗？

As they report in Nature, the critter, which lived around 55m years ago, in the Eocene epoch, seems to be the most primitive relative of tarsiers, mouse-sized primates which now inhabit the islands of South-East Asia.

这种活在大约五千五百万年前始新世时期动物似乎是眼镜猴（这种灵长类动物有老鼠一样体型，现在居住在东南亚岛屿上）最原始亲戚。