An operator, such as the + sign, is a character (or sometimes a short sequence of characters) that indicates a computational operation. In an expression, a term must be one of the following.
操作符，例如+，是一个字符(或者有时候是一小串字符)指明了运算种类。
2
Practical operation results show that the cluster analysis method can considerably improve the accuracy of short-term load forecasting.
实际运行结果表明：利用聚类分析法进行负荷短期预测，短期负荷预测的精度大大提高。
3
That is to let the layman, through the shortterm education practice and be able to play the operation.