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地球的南北极分别是南极洲和北冰洋，它们几乎长年都是冰天雪地。春去秋来，太阳直射点发生迁移的时候，这两个冰封的世界随之发生最极端的季节变化，从极地冬天的黑暗和严寒转变到极地夏天的午夜和光明，太阳全天24小时不落。
n. 灾难
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- The annual melt has begun.
- 每年一次的解冻期来了。
- This is a challenging time for the bear family.
- 对于北极熊一家来说，这是一个极富挑战性的时刻。
- One out of every two cubs do not survive their first year out on the ice.
- 两只幼熊中往往会有一只无法在第一年存活下来。
- As the sun's influence increases, the sea ice seems to take on a life of its own.
- 随着太阳的威力逐渐增强，海冰仿佛有了自己的生命。
- Glacial melt waters pour from the land, mingling with the sea and speeding up the thaw.
- 融化了的冰川水从陆地上喷泻而出，与海水交汇，加速了解冻。
- The seascape is in constant flux as broken ice is moved on by winds and currents.
- 海洋在不断地变迁，破裂的冰块在风和洋流的作用下不停地移动着。
- The ice is becoming too weak to support a male polar bear.
- 冰面开始变薄，已经很难承受一只雄性北极熊的重量。
- He attempts to spread his weight,
- 这只北极熊试图分散身体的重量，
- but the ice that has supported him all winter is rapidly disintegrating.
- 但是在冬天能够支撑它的冰面现在正迅速地解体。
- Each year, as the climate warms, the Arctic holds less ice.
- 每年的天气变暖时，北冰洋的冰就会减少。
- This is a disaster for polar bears.
- 对于北极熊而言，这是一场灾难。
- Without its solid platform, they can't hunt the seals they need in order to survive.
- 没有坚实的冰作为平台，北极熊就不能猎捕它们赖以生存的海豹。
- This may be a glimpse of the unstable future faced by this magnificent creature.
- 这种巨大生物的前途很不乐观。
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