ファイバー光学: fiber optics

fiber optics (US), fibre optics (UK)

specialist; expert

fiber (US), fibre (UK)

化学工学: chemical engineering

高額: large amount of money / 工学: engineering / 光学: optics / 後学: future reference / 好学: love of learning

speciality/specialty; subject of study; subject of expertise; area of interest; profession

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

a house / one's own home / a home, household / a family

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