physics (as an area of study)

specialization, specialisation in a particular field or skill

(Buddhism)

to specialize, to specialise

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

physics, the physical aspects of a phenomenon or a system

nuclear physics

Clipping of 原子核物理学 (genshikaku butsurigaku, “nuclear physics”).