名词
中文翻译：胶片测长仪
同义词：
['film gauge', 'film gauger', "film gauger's scale"]
例句：
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1. The film gaugeis used to measure the length of the film during the exposure process.
胶片测长仪用于测量曝光过程中的胶片长度。
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2. The film gauge was used to ensure that the film was properly exposed.
胶片测长仪被用来确保胶片得到适当的曝光。
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3. The film gauge was used to measure the distance between the camera and the subject.
胶片测长仪被用来测量相机和主体之间的距离。