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2047 篇文章
These endangered birds are visitors. They've come down from the north to escape the even colder conditions in Siberia.
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These endangered birds are visitors. They've come down from the north to escape the even colder conditions in Siberia. 这些濒临灭绝的鸟儿从更加寒冷的西伯利亚来访

the deciduous forests are changing.
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the deciduous forests are changing. 可以看到落叶林在不断变化

Leaves that have provided food and shelter since the spring, are now shed.
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Leaves that have provided food and shelter since the spring, are now shed. 从春天开始提供给动物食物和掩护的树叶 开始脱落了

Male red deer are starting their rut.
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Male red deer are starting their rut. 雄性马鹿正在按惯例行事

The rules are simple.
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The rules are simple. 规则很简单

the days are beginning to shorten,
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the days are beginning to shorten, 白昼开始缩短

The nutrients in a generation of cicadas are returned to the soil, all at once
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The nutrients in a generation of cicadas are returned to the soil, all at once 这些蝉给土壤提供了大量养分

that soon all the predators are full to the point of bursting
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that soon all the predators are full to the point of bursting 使得捕食者数量很快就暴涨

The adults are clumsy and very edible.
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The adults are clumsy and very edible. 成年蝉不仅笨拙而且非常美味

At first, there are merely thousands
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At first, there are merely thousands 一开始,不过几千只