conˌtrolled exˈperiment noun [countableC] TEST/EXPERIMENTa scientific test done in a place where you can control all the things that might affect the test 受控试验,控制性实验 a controlled experiment to determine the effects of light on plant growth 测定光照对植物生长的影响的一次受控实验
controlled experiment• This has not yet been measured by a properly controlled experiment.• Two of the four specimens known to be infected with M tuberculosis were positive in the controlled experiment.