If you immigrate to New Zealand, can you go back to work for a long time ... I heard that New Zealand allows dual citizenship.

You can return to work for a long time, but you must get a green card and you are not allowed to have dual nationality. Although New Zealand allows dual citizenship, China does not, so the premise of dual citizenship is that both countries recognize dual citizenship, but you can choose to take the New Zealand green card instead of naturalization. New Zealand's green card system is quite special in the world, which means that as long as you get a green card, you don't need to guarantee the annual residence time there (unlike Canada and Australia).