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。

youdao

Babies often get red cheeks when they're teething.

婴儿出牙时脸蛋常常是红的。

《柯林斯英汉双解大词典》

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。

《牛津词典》

An angry person's neck often becomes red.

VOA: special.2009.12.06

Local leaders still tend to negotiate with Moscow one-to-one, often down red, Soviet-era, telephonic hotlines.

ECONOMIST: Devolution is not always good for democracy

Mr Wright said he wanted resources concentrated at the "sharp end" rather than "costly and often unnecessary red tape".

BBC: South Yorkshire PCC candidate Gillian Radcliffe pulls out

Most MRSA infections acquired in community settings present themselves as sores or boils and often appear red, swollen, painful or with drainage such as pus, the CDC says.

CNN: NFL stars no match for bacteria