necessary operation的用法和樣例：
例句
- A symbol that represents the action to be performed in a mathematical operation.
表示數字運算中所要執行的動作的符號。 - Through your presentation and construction of the routine, you should create the necessary misdirection that makes any move seem invisible.
在你表演與建立流程的過程中，你應該製造必要的誤導以使任何的動作隱形。
