Our lives have become more digital（数字化的）in the modern world.【小题1】However, spending a lot of time working, reading, texting and gaming through digital devices（设备）is bad for our eyes.

According to the American Optometric Association,70 to 75 percent of computer workers have eye problems.【小题2】. People with digital eyestrain may get headaches, dry and red eyes, eye pain, watering and other problems.

【小题3】“Children get cellphones at younger ages and are using them very often during the day,” Sarah Hinkley, spokeswoman for the American Optometric Association, told USA Today.

The good news is that there are many things you can do to lower digital eyestrain.【小题4】Your hand should rest comfortably on the screen, as if you’re high-fiving the screen. Enlarge text size until your eyes feel comfortable. When you are using a mobile phone, keep it at least 30 cm from your eyes and just below eye level. Try not to use it under sunlight.

【小题5】Every 20 minutes, take a 20-second break and look at something 20 feet（about 6 meters） away.

In a primary school of Yunnan, there’re over 500 students, but no one is nearsighted (近视的). It’s hard to believe. Three hours of outdoor play and no mobile phones or computer—this might be the reason why they all have good eyesight (视力).

In the school, children eat healthy food and have enough sleep every day. During class breaks, all of them need to go outside. When the three sports teachers of the school are busy, other teachers will teach students to play basketball and table tennis.

To stop students from using mobile phones, the school installed six public phones in the hallways for them to call their parents. Even on weekends and during vacations, the school tells parents to care about kids’ eye health in teacher-parent WeChat groups.

Sun Fubiao, the primary school’s headmaster (校长), tries his best to help students protect their eyesight, because he himself and five other teachers are nearsighted. “It’s uncomfortable to do many things wearing a pair of glasses in daily life,” he said. “I do not want the children to have the same bad experience.”

Now, people come up with many ideas to protect (保护) children’s eyesight. Children should play online games for no more than three hours a week. They need to do eye tests each term. Schools can’t give homework to first and second graders. These ways are really useful for children. But for them, it’s more important to go outside and play.

Humans have many organs（器官）, but you can enjoy lots of things because of your ears. Do you know how the ears work?

The ear has three parts: the outer ear（外耳）, the middle ear and the inner ear. The outer ear is the part you can see. It collects sounds around you. The sounds then travel down to the middle ear, the inner ear and then to your brain.

Your ears never stop working, even when you are asleep! In other words, your ears continue hearing sounds, but you can’t hear the sounds just because your brain ignores them.

But ears do more than hear. They help you keep balanced（平衡的）, too. In the inner ear, there are organs that are filled with liquid（液体） and covered with small hairs. When you move your head, the liquid and hairs move, too. They send messages to your brain about the position of your head.

More surprisingly, ears even help to taste food. Of course, you don’t actually taste food with your ears. But there are nerves（神经） running through the middle ear that connects the tongue to the brain. If something happens to your ears, you might have a hard time telling different tastes.

The ears are truly important organs. We should protect our ears well.