They fixed on him to speak on their behalf.

他们已经确定他作为代表发言。

youdao

The company authorized her to speak on their behalf.

公司授权她代表公司发言。

youdao

I said that it has no help, I see people suffering and I want to speak on their behalf.

我说那没有用，我看见过在受苦的人们而我想代表他们说话。

youdao

She is one of several Goodwill Ambassadors who have lent their fame to this video to speak out on behalf of the millions of children who continue to be cruelly taken advantage of.

VOA: standard.2009.10.08

And the entire people of Israel appreciate it, and I speak on their behalf.

WHITEHOUSE: President Obama & Prime Minister Netanyahu: "The Common Goal is Peace" | The White House

First up is the Environment, Food and Rural Affairs Secretary, Owen Paterson, and then MPs have a chance to quiz their colleagues who speak on behalf of the Church Commissioners, the Public Accounts Commission and the Speaker's Committee on the Electoral Commission.

BBC: Week ahead

Far better to cherish raucous, impertinent journalism that can speak truth to power on behalf of its readers and entertain them enough to secure their loyalty.

CNN: Why the UK should avoid muzzling its free press