and when the cold bites they have these upper slopes to themselves.
每当严寒袭来这些山坡就成了它们的天下

Question

But these forests hold fewer challenges for the more mobile.
不过这些森林对于更灵活的动物来说却没有什么挑战性
The golden snap-nosed monkey, like the giant panda, lives only in China.
和大熊猫一样川金丝猴只生活在中国境内
Their thick fur allows them to survive at greater altitudes than any other monkey
它们有厚实的毛发所以能比其它猴类更能适应高海拔气候
and when the cold bites they have these upper slopes to themselves.
每当严寒袭来这些山坡就成了它们的天下
Even if you have a warm coat
虽然有了暖和的“大衣”
it apparently helps to surround yourself with as many layers as possible.
最好还是与尽可能多的伙伴挤在一起保暖
But at least these monkeys have a choice -
这些猴子至少还有一个选择

来自《行星地球第一季第二集 Planet Earth S01E02 山地》第 245 行

and when the cold bites they have these upper slopes to themselves. 每当严寒袭来 这些山坡就成了它们的天下