Stuttering causes sufferers to get stuck repeating or prolonging sounds, syllables or words that interrupt the normal flow of speech.

VOA: standard.2010.02.11

He's simply repeating the sounds of the words that are given to him.

对他而言,这仅仅就是简单的重复。

耶鲁公开课 - 1945年后的美国小说课程节选