v.露齿而笑,咧嘴大笑;
n.露齿的笑,咧嘴的笑 ;
例句:
An enormous grin spread across his face.
他咧着大嘴笑了。
He always had this inane grin.
他总是这样傻傻地咧嘴笑。
Mary gave her a sheepish grin.
玛丽难为情地冲她咧嘴一笑。