chair (the position of a lecturer or professor; the person holding this position) / a lecture or short course on a subject

to study / to learn

prevention or protection, especially from disease or natural disasters

prevent disease or suffering due to natural disasters

participation, commitment

to participate, to join, to enter

medicine (field of study)

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