office → officiate、officious

office n. 办公室，办事处；职位，公职
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officiate [əˈfɪʃieɪt]
v. 就职，履职；主持
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例：Mr Ellis was selected to officiate at a cup game. 埃利斯先生获选执法一场杯赛。（柯林斯词典）
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