...时间數列受到四种现象之影响趋势变动Trend循环变动Cycle季节性变动Seasonality随机变动Random14趋势变动（Trend Variation）指歷史资料逐渐且缓慢的呈现上升或下降的变化。
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variation trend 变化趋势
canonical trend variation 规范的趋势变化
long-trend variation 长趋势变化
The Variation Trend 变化趋势
climate variation trend 气候变化趋势
secular variation trend 长期变化趋势
topographic variation trend 地形变化趋势
trend of runoff variation 径流变化趋势
There exists an increasing-trend variation in the annual mean moisture sink and the precipitation over the central-eastern part of Southern China and a decreasing-trend in the evaporation.
华南中、东部的年平均水汽汇与该地区的年平均降水一样，存在增加的气候变化趋势，而该地区的蒸发量则有减少的趋势。
I tell them not to worry because it is probably just a random variation, not a significant trend.
我告诉他们不要担心，这可能只是个随机的变化，而不是显著的趋势。
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。
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