a specialist, an expert

security

security; safety / (finance) security

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

(law enforcement) police bodyguard; police officers responsible for close protection

Alternative form of コンピューター