Green card: It is the common name of "permanent resident card". This name comes from the American permanent resident card (the early American permanent resident card was named in green), and later it refers to the permanent resident card of any country. Simply put, a green card is a document issued to permanent residents.
PR: short for permanent resident, which means "permanent resident".
Permanent residence: short for permanent resident, synonymous with PR. The so-called permanent resident is a form of immigrant country residents, and refers to foreigners who immigrate to their own country and have the right of permanent residence in their own country. If he emigrates from China to live permanently in Australia, he is still a citizen of China, but he has the right of permanent residence in Australia. He enjoys the same treatment as an Australian citizen in social welfare, education and so on, and of course he has to pay taxes.
Naturalization: Naturalization in the country of residence. Permanent residence in Australia, you can apply for Australian citizenship after meeting the naturalization conditions. Once approved, it will become an Australian citizen. For Australian permanent residents born in China, according to China Nationality Law, their original China nationality will be automatically lost. Citizenship for permanent residence is voluntary. You can be naturalized or not, and keep your original nationality for life.