“neutral-density filter”的概念、定义、翻译、参考文献-科学参考

单词	neutral-density filter
释义	neutral-density filter [`nü·trǝl ¦den·sǝd·ē `fil·tǝr] ^OPTICS An optical filter that reduces the intensity of light without appreciably changing its color; used on a camera when the lens cannot be stopped down sufficiently for use with a given film. Also known as gray filter; neutral filter.
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