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They're the most powerful erosive force on our planet.
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They're the most powerful erosive force on our planet. 它是地球上最大的侵蚀作用

but on a much longer timescale.
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but on a much longer timescale. 可是不会持续多久

Yet they gather in some numbers on these apparently barren slopes.
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Yet they gather in some numbers on these apparently barren slopes. 然而却有一定数量的灰熊 聚集在这片不毛之地

It seems to be an odd creature to find on these high rocky slopes.
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It seems to be an odd creature to find on these high rocky slopes. 很奇怪这样的动物为何 会爬到如此高的碎石斜坡上

they still rely on her for their food.
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they still rely on her for their food. 它们仍需要依靠母狮获取食物

but the Andes have the most unstable mountain weather on the planet
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but the Andes have the most unstable mountain weather on the planet 可是安第斯山的天气 是全球山区气候中最不稳定的

Their day ends as it began, safe on the steep cliffs.
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Their day ends as it began, safe on the steep cliffs. 这一天结束了 和开始时一样 它们又坐在了陡峭而安全的悬崖上

Volcanoes form the backbone of the longest mountain chain on our planet -
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Volcanoes form the backbone of the longest mountain chain on our planet - 火山构成了地球上最长山系的主干

An early warning system puts everyone on the alert.
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An early warning system puts everyone on the alert. “即时预警系统”使大家都警觉起来

if others are on the lookout.
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if others are on the lookout. 因为旁边有站岗的“哨兵”