[译] 校长主持了会议。
[误] The headmaster presided the meeting.

[正] The headmaster presided at the meeting.
[注] 动词 preside( = have the position of authority)意为“主持”，其后跟介词 over 或 at，又如：The city council is presided over by the mayor. 市长主持了市政会议。