The debris from an avalanche is clear evidence 雪崩肆虐后的残骸清楚地表明

99. This mother is leading her three youngsters
    熊妈妈带着三只幼崽
100. to a place where they can find food.
     去找东西吃
101. They need to descend as quickly as possible.
     他们得尽快下山
102. The debris from an avalanche is clear evidence
     雪崩肆虐后的残骸清楚地表明
103. that this slope is still dangerously unstable.
     这片山坡仍然非常不稳定
104. This is not a place to dawdle.
     此地不宜久留
105. And they have another reason to keep moving.
     他们继续前行还有另一个原因

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 102 行