In the late Oligocene, there was also a major split among the simians.

在渐新世晚期，猿类之间也发生了重大 分裂。

The oligocene was a time of changing environments  and the forests proailurus originated gradually turned into grasslands.

渐新世是一个环境变化的时期，起源的森林逐渐变成了草原。

And, during the early Oligocene, wooded grasslands that thrived in lower CO2 levels and a cooler climate also expanded.

而且，在渐新世早期，在较低的二氧化碳水平和较凉爽的气候中茁壮成长的树木繁茂的草原也在扩大。

Around 34 million years ago, the Eocene-Oligocene Transition  marked the first major period of global cooling and glaciation.

大约 3400 万年前，始新世-渐新世过渡标志着全球变冷和冰川作用的第一个主要时期。

For the most part, the rest of the Miocene continued the trends that began in the Oligocene.

在大多数情况下，中新世的其余部分 延续了渐新世开始的趋势。

What we do know is that the late Eocene and early Oligocene was a time of global cooling.

我们所知道的是，始新世晚期和 渐新世早期是全球降温的时期。

Then, in the cooler, drier climate of the Oligocene, a new habitat appeared: grassland.

然后，在渐新世凉爽干燥的气候中 ，出现了一个新的栖息地：草原。

These were species like Pseudobassaris, a ground-dwelling badger-like creature whose fossils have been found in Oligocene deposits in France.

这些是像 Pseudobassaris 这样的物种，这是一种地栖的獾状生物， 其化石已在法国的渐新世矿床中发现。

As their prey adapted to life in the new grasslands of the Oligocene, the mustelids did too.

当它们的猎物适应了渐新世新草原的生活时，鼬科动物也适应了。

During the Oligocene and Miocene Epochs, it made huge, spiraled dens in the earth.

在渐新世和中新世时期，它在地球上形成了巨大的螺旋状洞穴。