1. a measure of the visible electromagnetic radiation. 
   测量可见电磁辐射的单位。
2. photography that uses other kinds of radiation than visible light. 
   利用看不见的辐射光线来照相。
3. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves. 
   一种波长比可见光长比无线电波短的电磁射线。
4. Permeable to electromagnetic radiation of specified frequencies, as to visible light or radio waves. 
   可透过的可以让某些频率的电磁辐射通过的，如可见光或无线电波
5. The emission of electromagnetic radiation, especially of visible light, stimulated in a substance by the absorption of incident radiation and persisting only as long as the stimulating radiation is continued. 
   荧光尤指可见光等电磁辐射的散光，因某物偶然受到辐射而发光，持续时间由刺激物辐射的时间长短决定

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