这样一个变异区域称为梯度变异。

Such a range of variation is termed a cline.

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流感通过载体的传播就像是人们坐飞机或是鸟儿飞翔一样，意味着区域变异会很快传播到世界各地。

The spread of flu by carrier is akin to flying people or birds, meaning regional variations can spread quickly around the world.

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例如，全球和区域气候变化和自然变异可以影响天气，他说。

For instance, global and regional climate change and natural variability can influence weather, he said.

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