英语词汇“photographic negative”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	photographic negative
释义	photographic negative短语⁵⁹²⁴⁷ 基本例句底片 An apparatus for measuring the optical density of a material, such as a photographic negative. 比如人口密度就是指单位面积的人口数量。 http://dj.iciba.com
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