One of the things that makes your smart-phone so smart is that if you pull it out in the sun, it senses that——and dials up the screen brightness to compensate. But it's not a perfect solution.
"First of all, it’ s still not bright enough—you have to remember how respectable sunlight is." Shin-Tson Wu, a physicist at the University of Central Florida. The other problem, he says of the brightened screen, is it kills the battery. So Wu and colleagues have produced a battery-sparing alternative: an anti-reflective screen-coating. Based on the eyes of moths. " Nature is so rich ! We can learn a lot from nature. "The thing Wu and others have learned about moth eyes, is that they're uneven, dotted with tiny projections. That uneven surface reduces the reflection of light off their eyes一thought to help the bugs escape predators（捕食者）,and see better in low light. So Wu and his team built a similar surface with tiny dimples（凹），to cut down on glare. He says the dimpled coating could improve the readability of a screen by five to 10 times, compared to a normal smart-phone screen. The details are in the journal Optica.
The tech hasn't been commercialized yet, and that could take a few years. Which gives researchers time to take advantage of another property of these surfaces: they're flexible. Meaning the possibility of bendable displays. Combine that with the bendy batteries we reported on in a recent podcast（播客），and it looks the smart-phones of the future could be set for a real transformation.
28.Why do the researchers develop the anti-reflective screen-coating?
A. To brighten the screen. B. To make profits.
C. To take in the sunlight. D. To save the use of battery.
29. What inspired the invention of the screen?
A. The predators. B. The reflection of light.
C. The eyes of moths. D. The smooth surface.
30. How does the screen work?
A. It helps bugs escape.
B. It slows down reading.
C. The smooth surface protects our eyes.
D. The rough surface decreases the reflection of light.
31. What do the researchers expect of the screen?
A. It'll transform itself. B. It'll be environment-friendly.
C. It'll reach consumers soon. D. It'll be powered by recyclable batteries.