移动通信话务量作为一种时间序列，具有较强的非线性和随机性，而且易受节假日、旅游等客户行为及天气等其它因素的影响。
As a kind of time sequence, mobile telephone traffic has strong nonlinearity and randomicity, and is easily affected by the festival, travel, weather and other factors.
本文采用自然正交函数分解法对我国南方地区的降水气候序列与夏季（5～8月）逐日降水序列进行时空特征分析和对应天气形势分析。
In this paper the climatology of the precipitation, the daily rainfall series of months 5-8 and the correlative weather systems are analysed.
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