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讲解：
on behalf of sb | on sb's behalf
代表(或代替)某人:
On behalf of the department I would like to thank you all.
我谨代表全系感谢大家。
couple (of sth)
几个人；几件事物
We can do it in the next couple of weeks.
我们可在今后几个星期里完成这件事。
apologize (to sb) (for sth)
道歉；谢罪:
Why should I apologize?
我为什么要道歉？
