季节变动(seasonality variation)：周期数列其周期期 间为1年内者。 不规则变动(irregular variation)：观测值之变化是由 于偶发事件引起者。
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seasonality seasonal variation 现象称为季节性
seasonality variation
季节性的变化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
There is a variation of seasonality that incorporates what is going on at the time each year, but still avoids emotional reactions to headlines and surrounding conditions.
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