experimenter       
noun [ C ] uk/ɪkˈsper.ɪ.men.tər/ us/ɪkˈsper.ə.ment̬ɚ/
 实验者(员)
a person who carries out experiments (= tests to learn something or to discover if something works or is true)
  He was a great experimenter. 他是一个伟大的实验家。 
 The experimenter asks the children not to touch the doll and then leaves the room. 实验者要求孩子们不要触摸娃娃,然后离开房间。 
 See: experiment
 - More examples
 - Physics experimenters send particles crashing into targets at enormous speeds to find previously undiscovered particles.
 - She was particularly skilled as an experimenter.
 - Some experimenters have injected stem cells into cardiac muscle and seen a few become cardiac cells.