machine operator的用法和樣例：
例句
- As she passed out along the hall after getting her hat, a young machine hand, attracted by her looks, made bold to jest with her.
當她拿著帽子順大廳出來時，一個年輕的機床工人被她的姿色所吸引，大膽地和她說笑起來。 - Every normal operator is trivially subnormal.
每一個正規運算元顯而易見地是次正規的。 - In addition, an unconventional crossover operator is given to meet the constraints of the DM problem.
同時，設計了用於滿足決策問題的非常規交叉運算元。
