flash on and off中文什么意思

例句与用法

1. sparks were emitted from small black boxes and red lamps flashed on and off angrily .
   黑色的小盒子放出火花，红灯刺眼地忽亮忽灭。
2. fireflies flash on and off in the tall grass
   高高的草丛里，萤火虫忽隐忽现。
3. sparks were emitted from small black boxes and red lamps flashed on and off angrily
   火花从小黑盒里迸出，霓虹灯怒火般闪烁其辞。
4. sparks were emitted from small black boxesand red lamps flashed on and off angrily
   小黑盒子里迸出火花，红色灯泡发怒似地忽明忽暗。
5. i suggest to install a bulb above the door . when there is no one passing through, the bulb does not light; when there are people approaching, it will flash on and off; when there are people pass through, it will light up
   我建议在门上方装一个灯泡，当无人通过时，他是关着的，当有人接近时，会一闪一闪的，当人从下方同下方通过时，灯泡会整个亮起来。