"The old lady kept bumbling on about something, but nobody could understand her."

"老太太结结巴巴地停,可谁也明白她些什么。"

He kept bumbling on about something.

他结结巴巴地停。

I stammered out my history.

结结巴巴地讲述了过去。

He bumbled through his speech.

他结结巴巴地讲完了他。