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Warning:Laser in use

机译：警告：正在使用激光

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摘要

The use of lasers is very common; they serve as valuable tools in many aspects of our lives. Lasers come in a variety of forms and are used by doctors to correct our vision, to scan barcodes, or to create brilliant light shows at amusement parks. Instructors use them to teach astronomy or highlight their presentations; construction workers use them to cast a perfectly straight line; police use them to pinpoint vehicles with radar; and we enjoy teasing our cats and dogs as they playfully chase that elusive red dot. Most of us are accustomed to the small novelty keychain laser sold for a few dollars. This common laser emits an insignificant 5mW power beam. In recent years handheld lasers have become much more powerful, smaller, and substantially more affordable.
机译：激光的使用非常普遍。它们是我们生活中许多方面的宝贵工具。激光有多种形式，医生可以用来矫正我们的视力，扫描条形码或在游乐园中创造精彩的灯光秀。讲师使用它们来教授天文学或突出显示他们的演讲；建筑工人用它们来铸造一条完美的直线；警察用它们来查明带雷达的车辆；当猫和狗嬉戏地追逐那难以捉摸的红点时，我们喜欢取笑他们。我们大多数人都习惯了售价为几美元的小型新颖钥匙扣激光器。这种普通的激光发射微不足道的5mW功率束。近年来，手持式激光器已经变得功能强大，体积更小，价格更实惠。

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