它们以每年超过60英尺的速度向内地迁移，融入了热带稀树大草原的丰富草地和零星的树木。
As they travel inland at speeds in excess of 60 feet a year, they merge with the rich grass and scattered trees of the savanna.
"热带稀树草原位于热带地区，海拔较低，是一种稳定的生态系统，由广阔的草地和稀疏分布其中的树木或灌木组成，有些地区湿润，有些地区干燥。
Located in tropical areas at low altitudes, savannas are stable ecosystems, some wet and some dry consisting of vast grasslands with scattered trees or shrubs.
我来到这片被火烧焦的草地，因为这片开着野花的草原以自己的方式展现了人造物的另一个侧面，正如我马上要解释的那样。
I've come to this patch of fire-seared grass because in its own way this wildflower field is another item of human construction, as I can explain in a moment.
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