Scientists use the point at which a flickering light is seen as one continuous light as a marker for visual sensitivity.

科学家将闪烁的光视作连续光点，以此作为视觉灵敏度的标志。

When the device is operating, this gas becomes luminous and gives off a continuous whitish light. Thus provided for, I breathe and I see.

使用探照灯的时候，二氧化碳气发出一种连续不断的白光，照亮起来。有了这些设备，我就可以呼吸，可以看见。