behalf [bɪˈhɑ:f]

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n.利益，方面；支持，赞成，代表

representing ; instead of

Ken is not present, so I shall accept the prize on his behalf. 肯没有出席，所以我将代表他领奖。
They fixed on him to speak on their behalf. 他们已经确定他作为代表发言。