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In eastern China, transgression occured periodically during Eogene, and formed specially paleobio-cenosis,mineral association and rock type.

在中国东部早第三纪化过程中曾周期性侵,从而形成了相特征岩石类型、古生物组合。

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Earth Ancients

And the thing to know about REM sleep is it happens cyclically.

要知道,快速眼动睡眠是周期性发生

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周日奥秘揭晓

Some studies suggest that it may be a recurring magnetic event that has affected  Earth for approximately 11 million years.

一些研究暗示,这可能是一个周期性发生件,大约1100万年来一直影响着地球。

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经济学百科 The Economics Book (Big Ideas Simply Explained)

The Swiss historian Jean-Charles Sismondi was the first to identify the occurrence of periodic economic crises, but it was the work of a later economist, the Frenchman Charles Donoyer, 1786 to 1862, who revealed their cyclical form.

瑞士历史学家让-夏尔·西斯蒙第是第一个识别周期性经济危机发生学者,但揭示其周期性形式是后来经济学家、法国人夏尔·多尼耶(1786年至1862年)工作。

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