flash system

例句：

1. 1. The flash of lightning illuminated the dark night sky.
   闪电的闪光照亮了黑暗的夜空。
2. 2. The flash of her hair caught his eye.
   她的头发一闪而过，吸引了他的注意。
3. 3. The flash of excitement in his eyes was evident.
   他眼中的兴奋一闪而过。