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Light - Wikipedia The main source of natural light on Earth is the Sun Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps With the development of electric lights and power systems, electric lighting has effectively replaced firelight
LIGHT中文 (简体)翻译:剑桥词典 - Cambridge Dictionary The light was so bright that I had to cover my eyes The bomb exploded in a flash of yellow light The torch sends out a powerful beam of light She pulled the duvet over her head to try to shut out the light We saw a glimmer of light in the distance
Light | Definition, Properties, Physics, Characteristics, Types . . . Light is electromagnetic radiation that can be detected by the human eye Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10 −11 metres to radio waves measured in metres