Give an example of what "incoming" means.

This word has been circulating since before liberation. Before liberation, the public security bureau was called the police station, and the so-called "entering the police station" meant entering the police station. In any case, as long as you enter the police station, it is called "inbound". Up to now, no matter whether it is real detention or temporary detention, people have been arrested by the public security bureau or the police station.