Above the tree line there is a zone that is generally called alpine tundra.

林木线以上区域通常被叫作高山冻原。

Over three million wild reindeer migrate across the tundra.

超过三百万头的野生驯鹿加入到穿越苔原的迁徙之旅。

She remembers the tundra with fewer trees when she was a child.

她记得小时候的苔原上树木较少。

And her hands were like two frozen chunks of tundra.

她的手就像冻原上的两个冰块。

He must have fallen off somewhere out on the tundra.

他肯定是在冰原的某个地方摔下来了。

The tundra is released from its prison of snow and ice.

苔原被从冰雪的牢笼中解放出来。

" Let us gather tundra grass and thatch the roof, " Maud said.

" 我们还是去弄苔原草苫屋顶吧。" 茅德说。

Beavers may be following the northward expansion of vegetation onto the tundra.

海狸可能是在追随冻原植被向北扩展的脚步。

So, if you're planning on exploring the frigid tundra Hoth-style, it might be helpful.

所以，如果你计划像在霍斯一样寒冷的冻原探险，它可能会有所帮助。

The birch is racing over the tundra faster than the pines can keep up.

桦树在苔原上生长的速度比松树的速度快。

But in some parts of the tundra, gray wolves must travel great distances to survive.

但在苔原上的某些地方，灰狼必须远距离活动才能够生存。

But which places—Arctic tundra or Amazon rainforest—are most vulnerable to such climate change?

但是那些地方更容易受到气候变化影响呢？是北极苔原还是亚马逊热带雨林呢？

For lemmings, small fussy rodents, there is no place more comfortable than the Arctic tundra.

对于旅鼠这种小而挑剔的啮齿类动物来说，没有比北极苔原更舒适的地方了。

That means heading straight into the tundra on a four-wheeler.

这就意味着要开着四轮车直奔苔原。

" I think the tundra grass will make just as good a roof, " she said.

" 我觉得就用苔原草苫屋顶也行。" 她说。

They report today that a white-spruce population has migrated surprisingly far north into the Arctic tundra.

他们今天报告说，令人出乎意料，一批白云杉向北迁移到了北极苔原。

As the tundra is very windy, this causes deep drifts to surround the shrubs.

因为苔原经常刮风，这会导致深处的水流包围灌木丛。

Protected from the extreme climate by their thick shaggy coats, they're at home on the tundra.

有又厚又蓬松的毛皮帮助对抗极端气候，它们在苔原上生活得自由自在。

Arctic hare is a mainstay of the tundra diet and one the cubs seem particularly keen on.

北极野兔是冻原主要的食物小家伙们貌似对这一食物情有独钟。

Strong winds hurtled off the frozen sea, and thick fog and clouds hung low over the tundra.

强风席卷过冰冻的海面，浓雾和乌云沉沉的压在冰原上空。