In the past we used to have regular 10-year climatic cycles which were always followed by a major drought.

在过去我们习惯了每十年一次大的干旱的气候循环周期。

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The climatic cycles of the glacial period in Europe over the past 2.5 million years have accelerated this erosion process.

在过去的250万年里欧洲的冰河时期气候循环加速了这个侵蚀的过程。

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These cycles can be produced by climatic conditions or by internal feedback mechanisms.

这些循环是由于气候条件或内在反馈机制所造成的。

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Researchers Russell Ciochon and E Arthur Bettis III, from the University of Iowa, US, believe these climatic cycles may have caused the expansion of open habitats, such as grasslands and steppe.

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