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The Porcupine caribou herd is heading south into the Brooks Range.
豪猪驯鹿群正向南进入布鲁克斯山脉。
Away from the water, the caribou start to relax.
远离水后，驯鹿开始放松了下来。
It's a mistake.
这可是个错误。
Caribou may be faster than bears on the open plain, but they must also rest the calves.
在开阔的平原上，驯鹿可能比熊跑得更快，但它们也得让小鹿休息。
Grizzlies and polar bears are almost the same species and increasingly overlap and interbreed, but grizzlies are a more serious threat to the herd.
灰熊和北极熊几乎是同一物种，并且它们在越来越多地交叉繁殖，但灰熊对鹿群的威胁更严重。
The bear has learned to chase off the mothers and then search for calves hiding in the scrub.
这只熊已经学会了赶走母鹿，然后寻找躲在灌木丛中的幼崽下手。
He's found two.
它找到了两个。
In a moment of indecision, he loses both.
就在它犹豫的时候，两只都跑了。
The calf's mother gallops to his side.
小鹿的妈妈飞快地跑到它身边。
It's a huge victory after so much hardship.
在经历了这么多苦难之后，这是一场巨大的胜利。
Though not for the bear.
虽然对熊来说正好相反。
