They have no choice but to back down 它们别无选择 只得退下
Now it's the lions' turn to defend. 现在轮到狮子防守了
The calf must stay close to its protectors... 小象不能掉队
With little cover, the brazen cats don't even try to hide. 无处可躲 大胆的狮子都懒得藏了
Mammals that adapted well to the cold dominated these frigid lands... 适应了寒冷的哺乳动物 主宰着这冰雪天地
compacted to form permanent ice sheets several kilometers thick. 压缩成了几千米厚的永久性冰层
Without warm summers to melt them, 没有了温暖的夏季将其融化
led to an abrupt cooling of the planet. 导致地球温度骤降