They moved into the area during warm periods, called interglacial periods.

他们在温暖的时期进入该地区，称为间冰期。

But during the warmer interglacial periods, forests bounced back.

但在温暖的间冰期，森林恢复了活力。

Within that, you have cycles of “glacial periods” and “interglacial periods”.

其中，你有“冰期” 和“间冰期” 的循环。

We’re currently in an interglacial period called the Holocene.

我们目前正处于一个称为全新世的间冰期。

Glacial periods are colder and have a greater ice sheet presence, while the interglacial periods are warmer and more like the Earth is now.

冰川期更冷， 冰盖更大， 而间冰期更暖，更像现在的地球。