5.Laser beams have been produced in every color of the rainbow(red is the most common laser color),as well as in many kinds of invisible light,but each laser can emit one color and one color only.
5.激光束可以是彩虹中的每一种颜色(红色是最常见的激光颜色),还可以是许多种看不见的光,但每个激光器能且只能发出一种颜色的光。
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