We must not try to play off the boy troubled with a stammer.

我们可以取笑这个有病的男孩。

He stammered most when he was nervous.

他一紧张往往。

The witness stammered and then fell silent.

那个证人结巴地完出声了。

I stammered out my history.

我结结巴巴地讲述了我的过去。

She stammers when she feels nervous.

她紧张时。

He betrayed nervousness by stammering.

他话结结巴巴明他胆子小。