采用时差相关分析剔除与警情指标相关性不显著的指标，确定警兆指标；
Delete the warning omen index that are not apparently related with warning condition by using time relation analysis;
采用时差相关分析剔除与警情指标相关性不显著的指标，确定警兆指标；
Delete the warning omen index that are not apparently related with warning condition by using time relation analysis;
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