The tone of the speech was upbeat.

这次讲话的语气颇为乐观。

《牛津词典》

There seems to be something like a gentle parody, maybe even a mocking tone that fills the lines of the elder brother's ecstatic speech.

似乎有一种温柔的戏仿，可能甚至是一种嘲弄的语气，充满了哥哥狂热的演讲中。

youdao

Introduction is of great importance since it sets the tone for the speech.

开场白很重要，因为它为演讲奠定基调。

youdao

Mr. Ahmadinejad's tone flip-flopped during the speech, appearing at times deliberately provocative and other times soft and eager to begin negotiations.

WSJ: U.S. Walks Out on Ahmadinejad U.N. Speech

And my question is, do you think that the tone, the -- at the Tucson speech he talked about civility and the idea that you can discuss your disagreements without anger and without this sort of poison that has marked so much in Washington.

WHITEHOUSE: Press Briefing

Despite this, the self-assured tone of Mr Brown's speech to Parliament is understandable.

ECONOMIST: Not so rosy | The