eyepiece focal length

例句：

1. 1. The camera has a large eyepiece to capture the scene.
   这台相机有一个大镜头来捕捉场景。
2. 2.The scientist used an eyepiece to observe the object through the microscope.
   科学家用一个目镜通过显微镜观察物体。
3. 3. The doctor examined her eyepiece and found no signs of damage.
   医生检查了她的目镜，发现没有损坏的迹象。