On April 2, we said goodbye to Tiangong Ⅰ, China’s first space lab. According to the China Manned Space Agency(中国载人航天局), Tiangong Ⅰ re-entered the Earth’s atmosphere(大气层) and some of its debris(碎片) fell into the South Pacific Ocean.

There are many spacecraft(宇宙飞船) that are still in orbit(轨道) above the Earth. After finishing their trips, they will all re-enter the Earth’s atmosphere like Tiangong Ⅰ.

There are two types of re-entries: controlled re-entry and uncontrolled re-entry. Some satellites and manned spacecraft come back to the Earth in a controlled re-entry. Experts calculate(计算) the path of the falling spacecraft and its speed. They can guide the spacecraft to fall in a chosen area.

Some spacecraft may have problems while in space after a certain amount of time. These spacecraft come back in an uncontrolled re-entry. It is hard to tell when and where these spacecraft will fall until the last few hours. The US space station Skylab came back partially uncontrolled in 1979. Parts of the station fell in western Australia, but no one was hurt.

During re-entry, most of the spacecraft will burn up while passing through the Earth’s atmosphere. Only a small amount of the debris will reach the ground. The debris typically ends up falling into the ocean, China Daily reported.

Do you know what human rights are? They are basic rights that belong to every person in the world. They include the right to life, freedom from slavery (奴役), the right to work and education, and many more.

China has played a leading role in protecting human rights. On Oct 13, China was elected as a member of the Human Rights Council of the United Nations. The country has made great achievements in human rights since 1949, Xinhua noted.

For example, Chinese people who lived before 1949 lived through war and poverty (贫困). Average life during that time was around 35 years. After 70 years, China can feed more than 1.3 billion people and provide jobs for 770 million people. The country's life expectancy rose to 77.3 years in 2019, CGTN noted.

As for the right to education, Chinese people spent less than one year in school in 1949. Today, we have nine years of compulsory education.

Access to the internet is also a basic human right. As of June, 67 percent of China's population had access to the internet. That's 5 percent higher than the global average.

When winter comes, cranes migrate (迁徙) from northeast Siberia in Russia to Poyang Lake in Jiangxi Province, China. 【小题1】 However, climate change has influenced the birds’ living conditions.

In some years, the Poyang Lake experiences floods, while in others, it experiences dry weather. 【小题2】

To help deal with the problem, the local government has planted 70 hectares (公顷) of lotus roots (莲藕) in Nanchang. 【小题3】 The birds’ population has risen from about 3, 000 to more than 5,000 over the past 20 years.

Over the years, China has worked hard to protect migratory birds. Recently, 1,140 places in the country have been taken as important breeding (繁殖) grounds, wintering grounds and migratory stops. 【小题4】 They play a key role in cleaning water, preventing floods, and keeping the balance of the environment.

【小题5】 The law sets rules to help manage wetlands. And it stops harmful activities, including giving out waste water. Thanks to these efforts, China has reported more birds wintering in the wetlands.