Fiftyyears ago this Sunday, Theodore Maiman and his fellow scientists atHughes Research Laboratory shined a high-power flash lamp on a rubyrod, triggering a beam of coherent light: the first laser.
50年前的这个星期天，休斯研究实验室的西奥多.梅曼和科学家用高功率闪光灯照射红宝石棒，引发光束相干： 第一台激光器 。
Every main beam or dipped beam emitted by a headlamp or fog lamp carried by a vehicle shall be a beam of white or yellow light.
由安装在车辆上的大灯或雾灯发出的每束主光或低光，须是一束白光或黄光。
A beam of road lamp light shined into the hall through the window.
路灯通过窗户把一束光线照进了大厅。
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