Old immigrants hit the nail on the head: why can't they go back after going abroad?

See what kind of immigrant you are. If it is a green card, it is equivalent to obtaining permanent residency in this country and enjoying the same welfare benefits as the locals, but without the right to vote. This green card immigration will not affect your nationality, so you are still a citizen of China and will not affect your return to China. If you are a passport immigrant, you have the nationality of this country. Because China does not recognize dual citizenship, you must give up your China citizenship. It's not that you can't come back, but it's relatively troublesome, just like going abroad now requires an entry visa to China.