underground nuclear test

nuclear bomb test

experimental study

influence, effect

to influence, to have an effect upon

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

underground; subterranean

(history) a common courtier (a courtier who didn't get access to the imperial palace)