What are long boarding and short boarding?

For Canadian immigrants, those who are approved to immigrate need to land in Canada within the specified time to go through various immigration procedures. Some people stay in immigration prison after completing the formalities, which is called Changdeng. Some people still have some things they can't let go of in China, and they rush back to China to go through immigration procedures after landing in Canada, which is called Dwarf. Whether it is a long-term landing or a short-term landing is not necessarily related to which country it landed in. No country wants approved immigrants to go through formalities, so short-term boarding is not popular. If you declare a short board to the immigration officer when landing, you may encounter the trouble of being refused entry. At present, although no one stipulates that long-term boarding and short-term boarding are only for Canadian immigrants, this statement and practice are really popular only among Canadian immigrants.