听力文本

Whole populations of animals are now forced to travel great distances in pursuit of food and warmth.
动物们成群结队踏上，寻找食物和温暖的长途旅程
300,000 Baikal teal gather to escape from the Siberian winter by migrating south to Korea
30万只花脸鸭集体迁往南方的韩国，躲避西伯利亚的严冬
the world's entire population in a single flock.
仅这一群便集中了世界上所有的花脸鸭
But there are parts of the world that have no seasons.
但是，世界上有些地方却没有四季
In the tropics the sun's rays strike the earth head on
在热带地区，太阳辐射直射大地
and their strength is more or less constant all year round.
全年始终或多或少地，受到这种影响力的控制

That is why the jungle grows so vigourously and supports so much life.
因此，这里的丛林茂密葱郁，生命在此欣欣向荣
This forest covers only 3 percent of the planet's surface,
这些森林仅覆盖了地球表面的3%
but it contains more than 50 percent of all its plants and animals.
但其中的动植物种类却占到了全球的50%
The canopy is particularly rich.
树冠层是生命最繁荣的地方
There are monkeys, birds and millions of species of insects, exactly how many we have no idea.
这里有猴子、鸟、还有数百万种昆虫，至于确切数量我们不得而知
The character of the forest changes as we descend,
从上到下，森林的特点也在发生改变
becoming ever darker and damper, favouring different kinds of animals and plants.
越往下就越阴暗潮湿，适合各种不同种类的动植物

词汇解析

1.in pursuit of 寻求，追求
They have deliberately declined to recall faulty products endangering lives in pursuit of profit.
他们故意拒绝召回危害生命安全的问题产品以追求利润。

2.escape from 逃脱
He told us he managed to escape from the warehouse, but without his three sons.
他告诉我们他设法从这个仓库逃脱，但是他的三个儿子无法幸免于难。

3.head on 迎面地
You must address resistance head on and address people's needs to help them turn the corner.
你必须解决迎面而来的阻力、处理人们的需要，帮助他们渡过难关。

4.more or less 或多或少
The origins of these cultures are more or less obvious.
这些文化的起源或多或少是显而易见的。

视频及简介

北极的春季，北极熊妈妈和它的孩子从它们的洞穴中走出来，它们只有短短的两周时间，它们要在冰雪融化前穿越冰冻的大海，它们进退两难。在这集中，我们将看到一些最难得的、完整的北极熊生活的画面。