You send a photo to your friend face to face through your 4G mobile phone. He or she can receive it at once. But actually, the photo has to go to the base station first. The base station then sends it to your friend. When you use 5G, the photo will not go to a base station. It will go directly (直接地) to your friend's mobile phone. Your friend receives the photo much faster. This is D2D technology.

China's telecommunication giant（通讯巨头）Huawei has launched an App called Story Sign that will make it easier for deaf children and their parents to read bedtime stories.

The App uses image and optical（视觉的）character recognition（识别）to help deaf children to read by turning written text into a show of sign language. Users can also choose a book from the App's book library that is shown in sign language using active characters. The first book on the Story Sign platform is the popular children's book Spot the Dog. The developers aimed to make the App's main character Star interesting for both boys and girls.

“We created Story Sign to help make it possible for families with deaf children to enjoy a colorful story time,” said Andrew Garrihy, Huawei's CMO for Western Europe. “We hope that by making people realize the deaf literacy issues（识字问题）, people will be encouraged to give support to one of the fantastic charity partners whom we are working with.”

There are about 32 million deaf children around the world. Many struggle（挣扎）to learn to read, often because of a lack of resources that bridge the gap between sign language and written text. The App gives deaf children a tool that its creators hope will make it easier for them to read. The App can be downloaded from App stores in 10 different languages, including English, French, German and Italian.

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Mr Guo is a teacher from Xi’an. He asked his students to hand in their homework through a QR code (二维码). “We spent an hour or two in class learning how to make the codes, and in the end everything got easier,” said Guo. “When students finish the homework, they keep it on WeChat. Then each student makes his/her own QR code and gives it to me. So I can check their homework everywhere using my computer or telephone.”

The QR codes can be sent to Mr Guo by email, QQ and WeChat. When Guo scans his students’ QR codes, their homework appears on his phone. He finds that their homework becomes more creative, with many pictures, music and even videos.

Guo’s students like the new way and think it is interesting. “We are living in the information ago. Many students like to work with computers, which makes learning more fun.” said Tingting, a student of Guo’s.

“The paper is not easy to keep, but the code is easy to keep and share.” Guo said, “It is worth trying to use new technology in education. Education itself is a kind of creation. I don’t want my students to fall behind the times.”

However, some parents are worried. They are afraid that their children will spend too much time on computers and less time communicating with teachers. But in fact, it’s unnecessary. Students still need to look up information in books and write it down when they do their homework. They only use the code when they hand in their homework, which doesn’t take them too much time. Also for teachers, it allows them to check the students’ homework at any time. And it’s also an easy way to share homework with other students.