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1·Geographic isolation also can proceed slowly, over great spans of time.

地理隔离也可能在很长一段时间内进展都非常缓慢。

2·Completely Geographic isolation also can proceed slowly, over great spans of time.

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。

3·All this has combined to afflict Africa with the burden of geographic isolation.

所有这一切结合在一起使非洲饱受地理隔绝之苦。

4·Nor can we any longer fall back on our historical trump card of geographic isolation.

我们也不再能依靠天然屏障的历史王牌。

5·All that time in geographic isolation made Madagascar a Darwinian playground, its animals and plants evolving into forms utterly original.

所有这些时间在地理上的孤立使得马达加斯加成了达尔文的最佳活动场所，它的动物和植物进化形成的状态完全是原始的。