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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Since it is already a part of your tools and you're probably using it at least occasionally, maybe it's time to take advantage of what the DOM has to offer.

既然它已经成为您的工具的一部分，并且或许您偶尔还会使用它，我想现在应该充分利用它给我们带来的功能了。

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For whole days at a time he would lounge in his Windsor chair in the kitchen, reading the newspapers, drinking, and occasionally feeding Moses on crusts of bread soaked in beer.

整天懒洋洋的躺在厨房的温莎椅上，看报，喝酒，偶尔用沾着啤酒的面包渣喂喂摩西。

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While Palin's time at Fox was occasionally rocky, the network's news executive, Bill Shine, said Friday that "we have thoroughly enjoyed our association" with her.

WSJ: Fox News, Palin cutting ties

His mother died when he was 11 and his father, Emperor Charles V, was often abroad, occasionally even for years at a time.

ECONOMIST: Spanish empire

Fast forward a few more years, I reported on Mandela occasionally during my time as a correspondent at CNN London's bureau.

CNN: Flirting and freak outs of reporting Mandela