151 篇文章
Five million birds make this journey every year.
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Five million birds make this journey every year. 每年有五百万只雪雁都是这样迁徙

But for a short time each year, the long, dark winter releases its grip.
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But for a short time each year, the long, dark winter releases its grip. 每年却总有短短的一阵日子 漫长阴暗的冬天也会放松它的钳制

but once a year they come together to have their young.
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but once a year they come together to have their young. 然而 每年总有一次 这些它们将会聚集在一起 繁衍后代

Those that survive their first year have the best possible start in life
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Those that survive their first year have the best possible start in life 那些在第一年里 存活下来的小企鹅有着最光明的前途

and the Arctic ice melts sooner each year,
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and the Arctic ice melts sooner each year, 北极冰层融化的时间继续提前

For a few months each year,
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For a few months each year, 每年有几个月的时间

Each year, as the climate warms, the Arctic holds less ice.
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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

0ne out of every two cubs do not survive their first year out on the ice.
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0ne 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

It causes the ice to advance and retreat every year.
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It causes the ice to advance and retreat every year. 使得冰盖面积每年都在扩大和缩小

but these are the short moments that make it possible to live in deserts the year round.
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but these are the short moments that make it possible to live in deserts the year round. 但就是这些短暂的日子使它们 得以全年在沙漠中生活