Over millions of years, groundwater left deposits of a mineral called calcite, on the rock within Devil's Hole.

在数百万年的时间里，地下水在魔鬼洞内的岩石上留下了一种叫做方解石的矿物质沉积物。

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These are wood and stone sculptures that he's carved and marked with fire to illustrate the ferocity and intensity of the forces that have shaped our planet over millions of years.

这些木雕和石雕都是他用火雕刻和标记的，用以说明数百万年来塑造我们星球的力量的暴烈程度和强度。

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Multiple forces have shaped Shikotan over millions of years.

上百万年来，诸多力量在塑造着色丹岛。

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Natural gas is considered the cleanest of the fossil fuels, the fuels created by plant and animal remains over millions of years.

VOA: special.2009.10.23

It's happened over the course of millions of years of human evolution, but it's happened also in a relatively recent time frame when we think about the American diet and what people are eating, but also the world diet of course.

它们发生在人类数百万年的演化历程中,在近现代,当我们考虑美国人的食谱,当然也包括全世界的食谱,同样在发生着这些变革

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But many non-scientists are unsure about whether humans evolved over millions of years.

VOA: special.2009.02.25

Over millions of years, no bacteria are known to have developed resistance to this mechanism.

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"That force, applied over millions of years, can literally move mountains of rock around, " Beshore said.

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There are curiously shaped rocks, formed over millions of years as land was gradually eroded.

UNESCO: Culture