轻一点我要你搞我小穴视频-日韩人妻中文字幕高清在线-精品一区精品二区国产-韩国毛片在线播放第8-亚洲天堂成人在线免费网站-日韩精品电影一二区-欧美日韩国产精品1卡-色综合91久久精品中文字幕-黄色无毒免费av网站

The laser is called "the fastest knife", "the most accurate ruler", and "the brightest light".

In fact, the original Chinese name of laser is "Laser" and "Lace". It is a homophone of the English name LASER. The full name of the word LASER is Light Amplification by Stimulated Emission of Radiation, LASER, because foreign scientists feel that the English name is too long. , Then took the first letter of the main word in the full name and simplified it to "LASER".

 L= Light

 A= Amplified (amplified)

 S= Stimulated (stimulated)

 E= Emission

 R= Radiation (radiation, emission)

English Light Amplification by Stimulated Emission of Radiation translated into Chinese means "light amplification by stimulated emission radiation."

At the beginning, Chinese scientific and technical personnel translated it as "optical stimulated emission" based on the full English name of laser. The famous Chinese scientist Qian Xuesen felt that the translation was too long and suggested changing the name to "laser".