We all know that rice, wheat and corn are staples, but do you know there is another kind of staple food—potatoes? Potatoes have many advantages. They are a good source of vitamin C and potassium(钾). A potato’s vitamin C is as rich as 10 apples. What’s more,potatoes are low in calories(卡路里)-only three fourths of the same amount of wheat and corn, according toPeople’s Daily. Potatoes are easy to grow. It can be grown in both the north and the south during winter, spring and autumn. The plant is also able to bear drought(干旱). Some areas of China are facing water shortages, so the potato is safe to grow.

With these advantages, having potatoes as a staple food will make our menu more balanced. Now, many Chinese people treat potatoes more like vegetables, and eat them in the form of potatoes cooked with beef. But being a staple food, potatoes can be cooked differently. Scientists have succeeded in making potato flour(粉), noodles and other staple foods similar to those made of rice or wheat.

This is a list of some Chinese tea.

Green tea     Green tea is the oldest and most popular type of tea. It has been enjoyed in China for several thousand years. Green tea is made from the new shoots (嫩芽) of the tea leaves which are dried and processed. Longjing may be the most well-known brand of green tea.

Black tea     In Chinese and languages of neighboring countries, black tea is known as “red tea”. It is made from the new shoots of the tea leaves which are fermented (发酵) and dried. It has a lovely red color. Dianhong and Qimen are popular brands of black tea.

Wulong tea   Wulong tea, also known as blue tea, is made from a mixture of green and black tea. It is said that people who drink Wulong tea can lose weight. Tieguanyin and Dahongpao are two famous brands of this popular tea.

White tea   White tea is unfermented tea that has been quickly dried. It is lighter in color than other types of tea. Popular brands of white tea are White Peony and Silver Needle.

People like to make the V sign while taking photos. Do you often make the V sign（手势）when taking photos? You might want to do so less often from now on.

Experts (专家）say that it is possible to use the V sign to copy(复制）someone’s fingerprints（指纹）. Someone could take your photo, zoom in (放大）on your fingers, and then use AI technology(人工智能技术）to copy your prints.

Does that mean(意味着）you should not make the V sign in photos anymore? Not really. The fingerprints in your photos must be clear enough to copy. If the photo is taken from 1.5 meters or less away, your prints won’t be clear enough to copy. The photos we put online are usually not clear enough to copy. But still, you should be careful.

Did you know? Your fingerprints are unique. It means that no one else in the world has the same fingerprints as yours. Not even twins have the same fingerprints.

Your fingerprints stay the same from birth to death. This makes fingerprints one of the best ways to identify（识别） people.