a particle accelerator

take part in

cyclotron, particle accelerator

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

to research, to study

a piece of research, a study, investigation

a particle (body with very small size) / a particle (elementary particle or subatomic particle)

(colloquial) current boyfriend