Smartphone blindness happens when people lie on their side at night, with one eye against the pillow and the other staring at the smartphone screen.
While one eye adjusts to the dark, the other eye gets used to the bright light of the high-resolution screen. But when they roll over and open both their eyes, the eye which has been staring at the screen cannot cope with the darkness of the room. Subsequently, with both eyes uncovered in the dark, the light-adapted eye is perceived to be blind.
It usually takes several moments for the eyes to adjust, leading people to believe they are suffering from a severe problem.
The mayor should take steps to cope with the environmental issues.
[ 参考答案：市长应采取措施解决环境问题。 ]
Edited by 典典