behalf
noun uk/bɪˈhɑːf/ us/bɪˈhæf/
on behalf of someone(US also in behalf of sb); (on someone's behalf); (US also in someone's behalf)B2 代表…，作为…的代表;代替…
representing
On behalf of the entire company, I would like to thank you for all your work. 我代表全公司对你的工作表示感谢。
Unfortunately, George cannot be with us today so I am pleased to accept this award on his behalf. 遗憾的是乔治今天不能亲临，因此我很荣幸能替他领这个奖。
She wasn't able to be present, so I signed the letter in her behalf. 她不能前来，所以我替她在信上署名。