afocal lens

例句：

1. 1.The scientist used a focusing lens to capture the image of the distant star.
   科学家使用一个聚焦透镜捕捉远处恒星的图像。
2. 2.The camera has a focusing lens that allows you to adjust the focus manually.
   这台相机有一个手动聚焦的镜头。
3. 3. The microscope uses a focusing lens to magnify objects for closer inspection.
   显微镜使用一个聚焦透镜来放大物体以便更仔细地检查。