viewfinder release button

例句：

1. 1. The photographer carefully pressed the viewfinder release button to adjust the focus.
   摄影师小心翼翼地按下取景器释放按钮来调整焦点。
2. 2. The engineer had to press the camera shutter button repeatedly before the image was captured.
   工程师必须反复按下相机快门按钮才能捕捉到图像。
3. 3. The film developer used a special exposure release button to speed up the development process.
   胶片显影剂使用一个特殊的曝光释放按钮来加速显影过程。