使一卷底片曝光 expose a reel of film
采用底片接触曝光成像 Contact Printig
这张底片已经曝光了 This film has been exposed ; This negatives has exposed
当美国联邦调查局(FBI)要求她将底片曝光时，她立即拒绝了。
When the FBI asked her to hand over the footage publicly, she refused outright.
照完一张照片后必须过卷，否则底片会重复曝光。
You have to wind on after taking a picture, or your negative will be double-exposed.
小(有时候称“快”)焦比的望远镜确实能够在底片上呈现出更亮的图像，因此需要的曝光时间可以更短。
Telescopes with small (sometimes called "fast") focal ratios do, however, produce brighter images of extended objects on film, and thus require shorter exposure times.
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