At the heart of all that happens here is a single living thing. 这一切最终都依赖于一种生命体的存在

3. Eerie silence.
   万籁俱寂
4. But any feeling of emptiness is an illusion.
   然而 你若以为这里死气沉沉就大错特错了
5. The plains of our planet support the greatest gatherings of wildlife on Earth.
   草原维系了我们行星最丰富多彩的生命群落
6. At the heart of all that happens here is a single living thing.
   这一切最终都依赖于一种生命体的存在
7. Grass.
   草
8. This miraculous plant covers a quarter of all the lands of the Earth.
   这种神奇的植物覆盖了地球上四分之一的土地
9. Grasslands exist wherever there is a little rain, but not enough to sustain a forest.
   草地无所不在 一点雨水虽然不足以维系一片森林 却可使一片草地存活下来

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 6 行