Why is the announcement "The next stop is * * * *" appearing at the entrance of Beijing subway? Please pack your bags and get ready to get off. Please don't litter at will.

It should be that Beijing Station of Metro Line 2 will prompt you to pack your bags, and other stations will not prompt you to pack your bags. The train broadcast from Jianguomen Station or Chongwenmen Station to Beijing Station is like this: Beijing stands in front of the train. Passengers going to Beijing Railway Station, please take your luggage and make preparations in advance. Dear passengers, please help keep the environment clean, take care of the facilities in the station, observe the instructions for passengers and resist begging and performing arts. Thank you for your cooperation. The next stop is Beijing Railway Station. Please make preparations in advance so that everyone can believe you. Because the interval from Chongwenmen and Jianguomen to Beijing Station is limited, if the latter sentence is translated, it is estimated that it has not finished after Beijing Station.