Such changes are all but invisible over the short time scale of modern observations, and, it is argued, they are usually obscured by innumerable gaps in the imperfect fossil record.

这些变化在现代观测短时间范围内几乎是看不见的，而且，有人认为，这些变化常常被不完善的化石记录中的无数空白所掩盖。

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This was also the time of the industrial revolution, which brought a tremendous increase in the use of fossil fuels such as coal.

它也是在工业革命时期的，带来了煤等化石燃料使用量的巨大增长。

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Occasionally , a sequence of fossil-rich layers of rock permits a comprehensive look at one type of organism over a long period of time.

偶尔，一个富含化石的岩层序列可以让我们持续并全面地观察一种生物。

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This time Fossil may have a winner on its hands, though the product will initially likely appeal only to a niche of Palm enthusiasts.

FORBES: A Palm That Fits On The Wrist

Over time I think the transition is going to be more and more clean energy and over time fossil fuels become less prominent in our overall energy mix.

WHITEHOUSE: President Obama Holds News Conference

Over time, fossil and nuclear energy may look a lot less objectionable to many true environmentalists.

FORBES: Renewable Energy Delusions: Getting A Real Grip On Alternatives