and

4265 篇文章
and has taken them three months.
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and has taken them three months. 耗时多达三个多月

taken three has months them and
Exhausted and starving, they touch down inside the Arctic Circle,
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Exhausted and starving, they touch down inside the Arctic Circle, 虽然早己精疲力竭 饥肠辘辘 但它们终于返回了北极圈

circle touch starving inside exhausted down arctic they the and
They winter along the Gulf of Mexico, and in spring they fly the entire length of North America to reach the Arctic tundra.
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They winter along the Gulf of Mexico, and in spring they fly the entire length of North America to reach the Arctic tundra. 它们在墨西哥湾越冬 等到春天便一路飞过北美洲 来到这里的北极苔原

length gulf mexico fly along america entire tundra reach spring arctic north they of in winter the to and
and grass that has lain dormant and frozen throughout the winter sprouts once more.
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and grass that has lain dormant and frozen throughout the winter sprouts once more. 又开始发芽

sprouts lain dormant grass frozen throughout once more has winter that the and
and continue to sustain the biggest herds on Earth.
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and continue to sustain the biggest herds on Earth. 草便又继续维系着地球上 最大的动物群落的食物需要

sustain continue biggest herds the to earth on and
Beyond the limits of the last tree, the planet is barren and ice-locked.
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Beyond the limits of the last tree, the planet is barren and ice-locked. 在最后一批树木以外的地方, 处处是冰天雪地 一片荒芜

ice-locked limits beyond barren tree is of last the planet and
And the leaves and stems are cropped by great herds of antelope.
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And the leaves and stems are cropped by great herds of antelope. 而叶子和茎则被巨大的羚羊群所享受

cropped stems antelope great leaves herds of the by are and
and feeds more wildlife than any other.
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and feeds more wildlife than any other. 又是维系生命群落种类最多的

feeds than more any other wildlife and
0ne and a half billion swarm across the savannahs of Africa.
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0ne and a half billion swarm across the savannahs of Africa. 以15亿的数量聚集在非洲的稀树大草原上

savannahs 0ne swarm africa across of the billion half and a
Able to repair and reproduce itself rapidly, it covers more of the Earth's land than any other plant
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Able to repair and reproduce itself rapidly, it covers more of the Earth's land than any other plant 草能迅速地自我修复 繁殖能力极强 在所有植物中 既是覆盖地球面积最大的

reproduce repair plant able itself earth's than covers land more rapidly it any of other the to and