To begin with the conifers are sparse 一开始松树比较稀疏

7. The barren snows of the Arctic.
   冰雪覆盖的北极地区
8. A thousand miles from the North Pole, and heading south.
   这是距离北极点以南1000英里的地方
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

来自《行星地球 第一季 第十集 Planet Earth S01E10 季节森林》第 10 行