focal depth

例句：

1. 1.The camera's focal depth is adjustable, allowing for close-up shots.
   相机的焦距深度可调，允许进行近距离拍摄。
2. 2.The scientist used a microscope to study the microscopic world of bacteria.
   科学家使用显微镜研究细菌的微观世界。
3. 3.In photography, focal depth refers to the amount of light that can be captured by the lens.
   在摄影中，焦距深度是指镜头可以捕获的光线量。