曝光不足

例句：

1. 1.The photographer needs to ensure that the subjects are not exposed too long.
   摄影师需要确保主体不被曝光过长。
2. 2. The film was underexposed, so it needed to be developed again.
   那部电影被曝光不足，所以需要再冲洗一次。
3. 3. The scientist noticed that the samples were underexposed during the experiment.
   科学家注意到实验中的样本曝光不足。