a group or individual used as a standard of comparison for checking the results of a survey or experiment.
they saw no difference between the cancer patients and the controls
同义词：
standard of comparisonbenchmarkstandardcheck
3
a member of an intelligence organization who personally directs the activities of a spy.
he sat with his KGB control as the details of his new assignment were explained
4
Bridge
a high card that will prevent the opponents from establishing a particular suit.
he has controls in both minor suits
动词
1
determine the behavior or supervise the running of.
he was appointed to control the company's marketing strategy
同义词：
be in charge ofrunbe in control ofmanagedirectadministerheadpreside overhave authority oversupervisesuperintendoverseeguidesteercommandrulegovernleaddominatereign overhold sway overhegemonizebe at the helmbe the bosshave someone in one's hip pocketinformal：head upcall the shotscall the tunebe in the driving seatbe in the saddlerun the showpull the stringsrule the roosthold the purse stringshave someone/something in the palm of one's handhave someone eating out of one's handwear the trousers
2
take into account (an extraneous factor that might affect results) when performing an experiment.
