令我感到惊讶的是，我在北方视为理所当然的一切事物，在南美大草原上几乎都没有发生。
I was amazed that virtually all the things I took for granted up north just didn't happen in Savannah.
实验表明，如果美洲稀树大草原没有发生火灾，物种组成将发生显著变化。
Experiments suggest that if fire did not occur in savannas in the Americas, species composition would change significantly.
没有什么简单或单一的因素能决定一个给定的地点是否会成为热带草原，但部分因素似乎在热带草原的形成中扮演着重要的角色。
There is no simple or single factor that determines if a given site will be a savanna, but some factors seem to play important roles in their formation.
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