defocused reflector

例句：

1. 1. The camera's lens is defocused, so the image is blurry.
   相机的镜头失焦了，所以图像模糊。
2. 2. This reflector can be used to focus light on a specific area.
   这个反射器可以用来将光线聚焦在特定区域。
3. 3. The engineer used a defocused reflector to adjust the focus of the camera lens.
   工程师使用了一个失焦反射器来调整相机镜头的焦点。