Kevin uses " um" and " ah, " those sounds when he's thinking about what to say next.

凯文在考虑接下来要说什么时会用“嗯”和“啊”这些声音。

”Um” and “Ah, “Umm, “Uh” a lot and maybe I’ll get confused and I won’t be able to answer in a kind of smooth sort of way.

“嗯” 和“啊” ，“嗯，” 很多次，也许我会感到困惑，我将无法以一种流畅的方式回答。