The first time around, the templated version of f is called, with a string as the first argument type, and the character and double are packed off as the variable size argument.
首先调用 f 的模板化版本，第一个参数的类型是字符串，作为大小可变的参数提供字符和双精度值。
This means is fit for the time series forecast which difficult to judge the time series typical character. It don't need cost much time to search explaining variable as regression analysis.
该方法适合于对时间序列的典型特征难以做出判断的时间序列的预测，而且它也无需像回归分析中必须花费很多时间寻找解释变量。
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