完全的地理隔绝也可能在很长一段时间内缓慢地发展而成。
Completely Geographic isolation also can proceed slowly, over great spans of time.
所有这一切结合在一起使非洲饱受地理隔绝之苦。
All this has combined to afflict Africa with the burden of geographic isolation.
我们需要更多了解地理隔绝在促进新物种生成的作用。
We need to know more about the role of geographical isolation in stimulating the production of new species.
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