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。

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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。

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The case study shows that the ant algorithm, simple to be programmed and easy to be realized, can well solve the problems with complicated constraints for the short-term optimal operation.

实例证明，蚂蚁算法能够解决具有复杂约束的水电站短期优化运行问题，算法编程简单，易于实现。

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Clearly the Kenyan government could not sit back and do nothing after the kidnappings but Kenyans hope this is a very short-term operation lasting maybe just a few days.

BBC: Kenya's incursion into Somalia raises the stakes

By the end of the year, when the Fed has sold the last of its short-term bonds, Operation Twist will have reached its limit.

ECONOMIST: The Federal Reserve extends Operation Twist

With the end of Operation Twist, the Fed has largely depleted its stock of short-term Treasuries.

FORBES: Ben Bernanke's QE4: Another Step Toward Helicopter Money, And Away From Freedom