Operation era经营时代operationn.操作；运转；经营；行动；手术；运算；生效；（复）运筹学Operation on prostate前列腺手术operation constraints运行约束条件operation of the ship营运船舶Operation on adenoids腺样体手术operation programming作业计划Operation and Support作战和支援operation interacting营运联动operation order sheet操作票operation environment操追境operation period cost运营期成本

1. Then we checked up on the machine's operation record.
   然后我们查了查机器的操作记录。