1. in a flash : 瞬间；
及物动词
1. Why is that driver flashing his lights at me?
那个司机为何用灯照我？
2. The cars flashed past.
汽车飞驰而过。
不及物动词
1. A car flashed by.
一辆汽车疾驰而过。
名词
1. A flash of grief came upon her when she heard the news.
她听到这消息时内心感到一阵悲伤。
2. There was a flash of lightning a moment ago.
刚才有一道闪电。