The children stood gawping at the magician's performance, their mouths wide open.

### 解释 gawping 是动词 gawp 的现在分词形式。gawp 是一个非正式用语，意思是"目瞪口呆地看、傻傻地盯着看"，通常带有惊讶或愚蠢的表情。