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

"老太太结结巴巴地说个不停,不明白她说些什么。"

He kept bumbling on about something.

他结结巴巴地说个不停。

I stammered out my history.

结结巴巴地述的过去。

He bumbled through his speech.

他结结巴巴地他的演说。