assume the office of; hold the post of
take the chair
擔任會議主席
ride shotgun
擔任警戒 （對運送中人、物）
take charge
擔任領導
act as amiables compositeurs (of arbitrators)
擔任友好調解人
be charged with the preparatory work
擔任籌備工作
serve [act] as referee
擔任裁判
be the chairman of a trade union
擔任工會主席
conduct
擔任樂隊指揮
invite them to be advisers on after-school activities
請他們擔任校外輔導員