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Geologists are rapidly becoming convinced that the mammals spread from their central Asian point of origin largely because of great variations in climate.

地质学家们正迅速确信，哺乳动物之所以从它们的中亚起源地繁衍开来，很大程度上是因为气候的巨大变化。

— Ellsworth Huntington 埃尔斯沃思·亨廷顿