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This mother is leading her three youngsters to a place where they can find food.
熊媽媽帶著三只幼崽去找東西吃。
They need to descend as quickly as possible.
他們得盡快下山。
The debris from an avalanche is clear evidence that this slope is still dangerously unstable.
雪崩肆虐后的殘骸清楚地表明這片山坡仍然非常不穩(wěn)定。
This is not a place to dawdle.
此地不宜久留。
And they have another reason to keep moving.
他們繼續(xù)前行還有另一個(gè)原因。
After five months in the den, these bears are very hungry.
在巢里呆了五個(gè)月后，這些灰熊餓得正慌。
Bears that have hibernated throughout these peaks
這片山峰之間冬眠的灰熊，
now all descend to the valleys, where spring comes earliest.
現(xiàn)在都下山了，那里的春天來得更早。
In the Rockies, seasonal change is swift and dramatic.
落基山脈的季節(jié)變換迅速而突然。
In just a few days, the slopes turn from white to green.
幾天時(shí)間內(nèi)，白雪皚皚的山脈便會綠意盎然。
