preside over 管理；对（某事物）负有责任 control or be responsible for sth
preside verb [ I ]主持（会议或仪式）。
preside at 主持（会议、仪式等）lead; be president of a ceremony or meeting, etc.

【例句】
Who would be the best person to preside at/over the public enquiry?
谁来主持公众调查最合适呢？

She has presided over the district during a period of unprecedented growth.
这一地区在她掌管期间经历了前所未有的增长。