assume office

例句：

1. 1. He assumed the role of chairman at the meeting.
   他在会议上担任了主席的角色。
2. 2. The new manager assumed office after the departure of the previous one.
   新任经理在前任离开后上任。
3. 3. She assumed office as the president of the company.
   她被任命公司总裁。