The other reason is that mother bears may not be fat enough to produce milk for their babies, so some bears could stop having babies.
另一个原因是熊妈妈可能不够胖，无法为它们的幼崽产奶，所以一些熊可能会停止生育。
With thick layers of fat and fur, the bears are well prepared for cold climes.
北极熊因为有厚重的脂肪与皮毛而能很好的适应寒冷的气候。
The seals provide much of the fat the bears need for warmth.
海豹为北极熊提供了保暖所需的大部分脂肪。
Underneath their fur, polar bears have an additional 10-cm-layer of fat, called blubber.
在毛皮的下面还有一层十厘米厚的脂肪，名为鲸脂。
Two layers of fur and thick fat act as superb insulation, helping polar bears retain virtually all their body heat.
两层毛皮和肥厚的脂肪具有绝佳的隔热效果，可帮助北极熊保留几乎全部的体热。
Two layers of fur and thick fat act as superb insulation, helping polar bears retain virtually all their body heat.
两层毛皮和肥厚的脂肪具有绝佳的隔热效果，可帮助北极熊保留几乎全部的体热。
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