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We do eye exercises. We wear sunglasses. 1． But we usually forget another important part of our body-the ears.

Ears help us hear the world. But many things, such as loud noises, can cause hearing loss (听力丧失). 2． So how can we protect our ears? Let’s take a look together.

3．   

Dry your ears with a towel (毛巾) after swimming or taking a bath. If you feel water in your ear, shake (摇晃) your head a little bit. This can help you get the water out of your ear.

Also, when the sun is shining, wear some sunscreen (防晒霜) on your ears. During the winter, protect your ears with a hat or a scarf.

How to clean your ears

Usually our ears clean themselves. The earwax (耳屎) builds up, dries out and then comes out of the ear along with some dirt (污垢). Don’t clean your ears with anything sharp (尖锐), or it can make the earwax go too deep into your ears and hurt them. 4．

How to use headphones

Don’t listen to loud music on your headphones (耳机) for a long time. Follow the 60:60 rule: listen to music at 60 percent of your head phones’ maximum volume (最大音量) for no more than 60 minutes a day.

5．   

They do a better job of stopping outside noise so you can listen at a lower volume.

In our daily life, robots are often found to do work that is too dangerous, boring, difficult or dirty. And we often see kids play with toy robots.

________ There are some important characteristics (特征) that a robot must have. These characteristics might help you to know what is and what is not a robot. It will also help you to decide what you will need to build a machine before it can be considered as a robot. A robot has these important characteristics.

First of all, your robot would have to be able to feel the environment around it. Give your robot sensors (传感器): light sensors (eyes), touch sensors (hands), hearing sensors (ears) and so on.

A robot needs to be able to move around its environment. It can move on wheels (轮子), walk on legs or be driven by small engines (发动机). A robot can move either the whole body or just parts of it.

A robot needs to be able to make itself work. Some robots might make it with sunlight, some might with electricity (电).

A robot needs some kind of “smarts”. A programmer is the person who gives the robot its “smarts”. The robot will have to have a certain way to get the program so that it knows what it is and what to do.