darkroom timer

例句：

1. 1. We used a darkroom timer to capture the perfect shot.
   我们使用暗室计时器捕捉到了完美的镜头。
2. 2. The photographer set up his darkroom timer before starting the exposure.
   摄影师在开始曝光前设置了暗室计时器。
3. 3. The darkroom timer was crucial for the success of the photo shoot.
   暗室计时器对于这次摄影拍摄的成功至关重要。