岩石学: petrology

petrology

a university; a college

academic major

specialize in, major in

rock (natural mineral aggregate)

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

(Confucianism) Great Learning

he; boyfriend