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重点讲解：
1. ahead of 早于；在…之前；
The Prime Minister was speaking ahead of today's meeting.
首相在今天的会议开始之前作了发言。
2. on behalf of 代表；
He spoke on behalf of all the members of the faculty and staff.
他代表全体教职员工讲了话。
3. be responsible for 负有责任的；应承担责任的；
Mike is responsible for designing the entire project.
迈克负责设计全部工程。
4. hand over 移交；
They would like to hand over their financial affairs to another body.
他们想把自己的财务移交给另一个机构管理。
adj. 宪法的，合乎宪法的，体质的，组成的 n. 散步
