computer science

mastery, proficiency, expertise / semenarche, first ejaculation during puberty

to be well versed (in), to have expertise, to be well acquainted (with)

science

computerization; computerisation

computerize; computerise

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

Alternative form of コンピューター