operations操作这个单词为什么有复数？

operations操作这个单词为什么有复数？

表示“操作，手术”都有复数形式operations的用法例句1. A technique which uses two or more input/output units in an attempt to speed up input and output operations.为加速输入输出操作，使用两个或多个输入输出部件的技术。同ORoperation。2. The doctor performs operations with sterilized surgical instruments.医生用消过毒的外科手术器械做手术3 A set of operations that are to be performed sequentially, each of which(except the first) uses the output of the previous operation as input.一组要依次执行的操作，除第一个外，每个操作均使用前一个操作的输出作为输入。