英语听力：自然百科 冰冻星球 前往地球尽头—9
时间：2014-05-28 06:25:59
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（单词翻译）
Further south still, unstooped, shrouded1 figures end the flat monotony of the Tundra2.
This is the tree line, the first place on our journey with sufficient warmth and liquid water to enable a tree to grow。
Surviving here is so crushingly difficult that it can take hundreds of years for a
seedling3 to grow into a
stunted4 shrub5.
But even small trees can provide / cover for a
predator6
Wolves, these in northern Canada are the largest and most powerful in the world and they are setting out to hunt
The pack is 25 strong, a sign that the
prey7 they are seeking is formidable
These bison/ are even bigger than their southern cousins and the largest land animals in North America
For generations, wolves and bison/ here have been shaped by their battles for the each other, making each the most impressive of its kind
The bison/ would not stay in long among the trees, they are not safe here
The wolves are closing in, but their chance of
ambushing8 the bison/ in the woods has passed, their prey are now in the open and group together for safety.
The wolves will need to work as a team, exact to make a kill.
They circle the
herd9, try to unsettle it and split it up
But the bison/ are / armed and dangerous, they will be safe as long as they stick together.
The wolves, up their game, hurrying the herd, a ploy to trigger a stampede and split away one of the smaller ones
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