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1·The content of lead had an obvious seasonal variation.

铅具有较明显季节变化。

2·There were obviously seasonal variation of polychaete quantity.

数量有明显的季节变化。

3·There is little seasonal variation in the incidence of the disease.

在该病的发病率方面存在着极小的季节性差别。

4·The characteristics of dust' s seasonal variation are significant.

沙尘天气的发生具有明显的季节变化特征；

5·The attack seasons were mostly in winter and during seasonal variation.

发作季节主要为冬季及季节更替时。

6·Seasonal variation was single peak that spring was the high incidence period.

发病季节分布呈现春季单峰。

7·Circular distribution analysis was used to study the onset seasonal variation.

圆分布分析探讨脑卒中患者发病时间的季节规律。

8·The seasonal variation index (SVI) is used to fit the seasonal trend of power load.

季节变动指数(SVI)用来拟合电力负荷的季节性趋势。

9·The seasonal variation of zooplankton biomass was in agreement with that of phytoplankton density.

浮游动物生物量与浮游植物密度的季节变化趋势相一致。

10·In forecasting, it is unsuitable to apply Autoregressive model to time series with seasonal variation.

对于具有季节变动的时间序列，使用自回归模型进行预测是不适宜的。