In winter, female polar bears give birth to two cubs in an igloo-like den, which insulates the mother and babies against the brutal winds and frigid Arctic temperatures outside.

• 意译：北极熊图片集。在冬天，雌雄给予出生的两只幼兽安置在圆顶似的洞穴，那是为了隔离妈妈和小兽来对抗暴风和寒冷的北极温度在洞穴的外面。