係

family registration official

affiliate (company, organization)

concerned bodies; interested organizations

lunch monitor; student responsible for school lunch distribution and clean-up

inspector; gauger; passer

safety factor

foreign relations; international relations; external relations; diplomacy

receptionist; welcoming committee

publicist; public relations officer; press agent; propagandist; flack

reciprocal relationship; mutually beneficial relations; relationship with benefits to both parties

liaison officer; public relations man

strategic reciprocity; mutually beneficial relationship based on common strategic interests

consanguinity

close relationship

relevant authorities; competent authorities; authorities concerned

competitive relationship

librarian; person in charge of a library

equal relationship; (being on an) equal footing

affiliated company

Work of art, literature, music, etc. name

Dangerous Liaisons (novel, film); Les Liaisons dangereuses

proofreader

(train) station attendant; station employee; station staff

receptionist; desk clerk

extremely close relationship; collusive relationship

Grammar

relative