optical centre

例句：

1. 1. The optical center of the camera focuses on the subject.
   相机的光学中心将焦点对准主体。
2. 2. The optical center of the lens is where light enters and exits.
   镜头的光学中心是光线进入和退出的地方。
3. 3. The optical center of the telescope is located at the top of the instrument.
   望远镜的光学中心位于仪器顶部。