The beam of flashlight diverges, but it can be refocused with lenses . 一个发散的闪光灯束可以用透镜重新聚焦。
Synchronized blinker lights are set up in new york and san francisco . 两盏同步的闪光灯分别设在纽约和旧金山。
When the flash tube is triggered, light from it penetrates the ruby . 当打开闪光灯时,它所发出的亮光穿透红宝石。
A flashbulb located in one end of the box emits a burst of light of energy e . 箱内的一端有一盏闪光灯,它射出一个能量为E的闪光。
There's something else that's worth watching the latest news flashes and weather forecasts in moving letters running around the times building . 还有值得看的呢--在时报大楼周围有最近消息的闪光灯和活动字母的天气预报。