BBC听力 | 壮丽山脉 07
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This mother is leading her three youngsters to a place where they can find food.
熊妈妈带着三只幼崽去找东西吃。
They need to descend as quickly as possible.
他们得尽快下山。
The debris from an avalanche is clear evidence that this slope is still dangerously unstable.
雪崩肆虐后的残骸清楚地表明这片山坡仍然非常不稳定。
This is not a place to dawdle.
此地不宜久留。
And they have another reason to keep moving.
他们继续前行还有另一个原因。
After five months in the den, these bears are very hungry.
在巢里呆了五个月后，这些灰熊饿得正慌。
Bears that have hibernated throughout these peaks
这片山峰之间冬眠的灰熊，
now all descend to the valleys, where spring comes earliest.
现在都下山了，那里的春天来得更早。
In the Rockies, seasonal change is swift and dramatic.
落基山脉的季节变换迅速而突然。
In just a few days, the slopes turn from white to green.
几天时间内，白雪皑皑的山脉便会绿意盎然。
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