presideover与presideat的区别是什么
presideover释义: 主持;负责 例句: The PM returned to Downing Street to preside over a meeting of his inner cabinet. 首相回到唐宁街去主持一场核心内阁会议。 presideat释义: 主持;负责 例句: They asked if I would preside at the committee meeting. 他们问我是否会主持委员会会议...