Natural variation alone in the chaotic climate system would produce such a slowing every eight decades, even with the long-term warming trend seen.
自然气候变化的混沌系统单每八十年会出现这样的变缓趋势，即使长期变暖趋势出现。
Objective To study the variation trend on the incidence and epidemiological characteristics of birth defects during the period from 1990 through 1999 in Anren County.
目的了解1990 ~ 1999年湖南省安仁县出生缺陷发病率的动态变化趋势及流行病学特征。
By studying the space characteristics, the variation trend of mineralization in space distribution and sequenced rule of geometrical characteristics are shown.
通过空间特征研究，查明了矿化在空间展布上的变化趋势及其几何特征的有序性规律。
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