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5665 篇文章
has bushy gills to extract oxygen from the current.
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has bushy gills to extract oxygen from the current. 并依靠浓密的鳃从水中过滤氧气

have to hang on for dear life.
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have to hang on for dear life. 得有办法固定自己以保住性命

The hellgrammite, its body flattened to reduce drag,
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The hellgrammite, its body flattened to reduce drag, 这是鱼蛉 其扁平的身体 能减少水的冲击力

Streams join to form rivers,
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Streams join to form rivers, 溪流汇聚成河

it will travel hundreds of miles to the sea.
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it will travel hundreds of miles to the sea. 行程数百英里回到大海

Growing from humble streams to mighty rivers
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Growing from humble streams to mighty rivers 涓涓细流汇集成泱泱大河

and the eagle has to struggle to control it.
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and the eagle has to struggle to control it. 金雕不得不努力控制飞行

The eagles work in pairs to separate a young crane from the flock.
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The eagles work in pairs to separate a young crane from the flock. 两只金雕合作将一只小鹤 从队伍中分离出来

they use thermals, rising columns of warm air, to gain height.
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they use thermals, rising columns of warm air, to gain height. 可它们会利用热空气 ——呈圆柱形上升的热气流来获取高度

The cranes must gain height to avoid the building storm.
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The cranes must gain height to avoid the building storm. 鹤群必须提升高度 躲避正在形成的风暴