两极之间 3 - 英语听力
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[00:00.51]Their mother has not eaten for five months and has lost half her body weight.
[00:07.25]Now she converts the last of her fat reserves into milk for her cubs.
[00:13.22]The spring sun brings warmth but also a problem for the mother.
[00:19.36]It starts to melt the sea ice.
[00:22.49]That is where she hunts for the seal she needs to feed her cubs.
[00:26.77]And she must get there before the ice breaks up.
[00:30.86]For now though it's still minus 30 degrees and the cubs must have the shelter of the den.
[00:41.51]It's six days since the bears emerged and spring is advancing rapidly.
[00:47.54]But even now blizzards can strike without warning.
[00:51.48]Being so small, the cubs are easily chilled and they will be more comfortable resting in the den.
[00:57.62]But their mother must keep them out and active.
[01:02.39]She's becoming weak from hunger and there's no food on these nursery slopes.
[01:07.78]The sea ice still holds firm, but it won't last much longer.
[00:07.25]Now she converts the last of her fat reserves into milk for her cubs.
[00:13.22]The spring sun brings warmth but also a problem for the mother.
[00:19.36]It starts to melt the sea ice.
[00:22.49]That is where she hunts for the seal she needs to feed her cubs.
[00:26.77]And she must get there before the ice breaks up.
[00:30.86]For now though it's still minus 30 degrees and the cubs must have the shelter of the den.
[00:41.51]It's six days since the bears emerged and spring is advancing rapidly.
[00:47.54]But even now blizzards can strike without warning.
[00:51.48]Being so small, the cubs are easily chilled and they will be more comfortable resting in the den.
[00:57.62]But their mother must keep them out and active.
[01:02.39]She's becoming weak from hunger and there's no food on these nursery slopes.
[01:07.78]The sea ice still holds firm, but it won't last much longer.
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