Good morning, everyone! I am Li Hua, chairman of the Students’ Union.

Learning you are interested in a waste-sorting program in China, I am writing to give for you a brief introduction. As far as I know, Shanghai had become the pioneer of waste sorting in our country. Residents in Shanghai are allowed to simply dump their waste bags in dustbin. Instead, domestic waste is required to be classifying into four categories: dry refuse, wet trash, recyclable waste or dangerous waste. Face with the new rule and for every waste item under careful supervision (监督), many citizens in Shanghai find it a little too complicated and difficult. However, the majority of the people firm support the policy because it helps us live a greener life and makes our country most beautiful.

One type of recycling, called downcycling, involves repurposing a material into a new product of lesser quality. It can include varying grades of plastic, paper products, and other materials.

Downeycling     1     (know) as downstream recycling. It is most common in terms of     2     (industry) materials. These products lose their value as they are recycled,     3     limits their capacity for new use. Their recycled form is typically both weaker and cheaper     4     their original one. White writing paper, for example, is often downcycled into cardboard; once downcycled to this new form, it can no longer be used as white paper again.

    5     (give) products a new life is considered a good way to reuse materials and avoid waste. Once downcycled to their full capacity however, these materials are eventually so degraded that they cannot be reused further. Since downcycled products are considered of lower quality than their original form, they cannot be used in remaking their original product.

Products are provided with codes     6     (determine) their grades and whether or not they may be recycled. Plastic, glass, and aluminium products     7     (code) with the number one may be remade into something     8     equal or greater value. This type of recycling is known as upcycling, and represents the forward compatibility of recycled components.

Items available for downcycling often require additional chemicals, energy,     9     other treatments in order to transform them into something usable. Durable plastic products in particular require much additional treatment. Trash bins, tables, and chairs are also considered materials with     10     high energy cost to recycle.

10 . As Shanghai prepared to introduce mandatory(强制的) garbage sorting on July 1, games and toys that examined fun ways to spread information about the garbage sorting were to encourage younger people to take action.

A 15-second video of a game went on Chinese social media. In the video, players wearing VR headsets saw four different types of trash cans in front of them, and had to throw different types of garbage into the right buckets(桶) to get points. Although it was not the only VR game in the place, visitors lined up around the booth to explore it because of the garbage-sorting theme.

“As a citizen in Shanghai, I am in great need of this game. Maybe I won’t need to check how to categorize(将……分类) each piece of garbage on my phone while going through all my garbage every day if I play this game more often,” said Zhou Zhou, a youngster. But some social media users in Shanghai have complained about the difficulty of sorting different types of garbage.

Wu Xia, founder and CEO of VitrellaCore, the company that created the game, said the idea was to provide an interesting way of learning about garbage sorting. “It’s simple and easy to understand. People can practice sorting garbage without actually going through their trash, and it is a more effective method than using paper materials when training volunteers,” Wu said.