person

largely; mostly

a lot / a majority

excellent, outstanding, superior

be good at (a thing); be superior to (a person)

a chemist

discovery

to discover

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