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Grasslands occur where rain is too sporadic for forests to exist.
降雨量不足以養育森林時就會出現草原。
The rain that a grassland needs to survive for a year might arrive all at once.
草原生長所需的年降雨量可能會一次來臨。
Storms like these can release 12 inches of rain in 24 hours.
這樣的暴雨在24小時內能達到300毫米降雨量。
Not much fun if you're out in it.
淋起來可不好受。
Eventually the earth can't soak up any more, and the grassland undergoes a radical change.
最終土壤無法繼續吸收雨水，草原也完全變了樣子。
Many plants would drown here, but grasses thrive.
許多植物會被淹死，而草本卻會茁壯生長。
They grow so fast, their leaves quickly rise above the water and into the sunlight.
它們長得飛快，莖葉迅速伸出水面，沐浴在陽光下。
Here in southern Africa, water transforms one of the most remarkable grasslands on Earth, the Okavango.
在南非，降水能讓世界上最奇特的草原之一改頭換面，奧卡萬戈三角洲。
Every year, 5,000 square miles of grassland are flooded.
每年都有近一萬三千平方公里的草原被水淹沒。
For one pride of lions, this poses a major problem.
對于獅群來說，這成了最大的問題。
