prefocus cap

例句：

1. 1.The engineer used a prefocusing cap to improve the quality of the images captured by the camera.
   工程师使用了一个预聚焦帽来提高相机捕获的图像质量。
2. 2.The scientist conducted experiments with a prefocusing cap to study the effects of light on materials.
   科学家使用了一个预聚焦帽进行实验，研究光对材料的影响。
3. 3. During the filming, the director wore a prefocusing cap to protect his eyes from the bright lights.
   在拍摄过程中，导演戴着一个预聚焦帽，以保护他的眼睛免受强光的伤害。