Based on this technique and the principle of total reflection of light, a photoelectric instrument with electric process output is developed.

并利用电逻辑处理技术和光的全反射原理研制了具有电逻辑处理输出的光电浓度仪。

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Miss Leavitt found that the rate depends on the star's total light output (luminous Cepheids pulse more slowly than feeble ones) a discovery that allows them to be used for cosmic surveying.

ECONOMIST: Twirls and swirls from outer space