the fact or condition of functioning or being active.
the construction and operation of power stations
同义词：
functioningworkingrunningperformanceactionbehavioreffectforcepotencypowereffectivenessfunctioningworkingrunningup and runningoperativein usein actiongoingoperationalworkableserviceablefunctionalusablein working order/conditionviablein forceeffectivein effectvalid
2
an act of surgery performed on a patient.
I've never felt better since my bypass operation
同义词：
surgerysurgical operationsurgical interventionmajor surgeryminor surgery
3
a piece of organized and concerted activity involving a number of people, especially members of the armed forces or the police.
a process in which a number, quantity, expression, etc., is altered or manipulated according to formal rules, such as those of addition, multiplication, and differentiation.
