these bears are very hungry. 这些灰熊饿得正慌

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
106. After five months in the den,
     在巢里呆了五个月后
107. these bears are very hungry.
     这些灰熊饿得正慌
108. Bears that have hibernated throughout these peaks
     这片山峰之间冬眠的灰熊
109. 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
110. In the Rockies, seasonal change is swift and dramatic.
     落基山脉的季节变换迅速而突然

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 107 行