It's basically the same thing as a laser beam, the more familiar light beams, often red or green, used for surgery or to point at a PowerPoint presentation.
它本质上和激光束是一样的。激光是我们更熟悉的光束,经常是红色或绿色的,用于外科手术或者作为PowerPoint幻灯片演示用的激光笔。
Babies often get red cheeks when they're teething.
婴儿出牙时脸蛋常常是红的。
A red sky at night often indicates fine weather the next day.
夜空呈红色往往预兆第二天天气晴朗。
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