- 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
因此 这里的丛林茂密葱郁
来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 164 行