线聚焦聚焦对焦点对光成像清晰点无焦点不聚焦镜头的焦点焦距使聚焦软聚焦
The line focus focuses on the point where the light is focused and the image is clear. The point has no focus and is not focused. The focal length of the lens makes the focus soft and focused
以上为机器翻译结果，长、整句建议使用 人工翻译 。