This is the Taiga Forest. 这就是泰加针叶林

9. This is the very first place that trees can grow.
   这也是树木长到的最北处
10. To begin with the conifers are sparse
    一开始松树比较稀疏
11. but soon they dominate the land.
    再往南它们便马上支配了这片土地
12. This is the Taiga Forest.
    这就是泰加针叶林
13. There are as many trees here, as in all the world's rainforests combined.
    它的面积,是所有热带雨林面积的总和
14. The Taiga circles the globe and contains a third of all the trees on Earth.
    针叶林环球分布 占全球所有树木总量的三分之一
15. It produces so much oxygen, that it refreshes the atmosphere of the entire planet.
    它制造了大量的氧气 是我们这个地球的空气清新剂

来自《行星地球 第一季 第十集 Planet Earth S01E10 季节森林》第 12 行