单词：necessary operation
necessary operation的用法和样例：
例句
- A symbol that represents the action to be performed in a mathematical operation.表示数字运算中所要执行的动作的符号。
- Through your presentation and construction of the routine, you should create the necessary misdirection that makes any move seem invisible.在你表演与建立流程的过程中，你应该制造必要的误导以使任何的动作隐形。
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