line focus tube

例句：

1. 1.The engineer used a line focus tube to adjust the brightness of the display.
   工程师使用线聚焦管来调整显示器的亮度。
2. 2.The line focus tube was designed to improve image quality in video production.
   线聚焦管被设计用来提高视频制作中的图像质量。
3. 3.The line focus tube was a critical component in the camera's optical system.
   线聚焦管是相机光学系统中的一个关键组件。