He argued for the frontier as an agent of social change.

他主张将边界作为社会变革的推动者。

youdao

Mr. Obama's objective was not to communicate the fact that he was an agent of change.

奥巴马先生的目的并不是想要传达“他就是改变的代理人”这一事实。

youdao

We have made [technology] an all-purpose agent of change.

我们已经把技术作为了一种改变的万能中介。

youdao

(NO TRANSCRIPTS) In 2008,Kennedy saw an agent of change in Senator Barack Obama and became one of the first prominent Democrats to endorse Obama's bid for the party's nomination for president.

VOA: standard.2009.08.26

Indeed, the future of the institution as a credible agent of change on the continent is dependent on how the Kenyan process plays out.

CNN: High stakes in Kenya's critical election

It is dependent on the plasticity of the brain, and on the fact that experience is as powerful an agent of change as natural selection.

NEWYORKER: A Man of Letters

But even those admirers would not be able to call him an agent of change.

CNN: Candidates claim to be agents of change