If you use a one-way ticket when entering the station, you should use a one-way ticket when leaving the station. If the one-way ticket is not enough, please ask the subway staff to make up the ticket.
If you don't swipe your card when you enter the station, you can't get out. Then you should take the initiative to ask the subway staff to supplement your car record. If the subway doesn't handle it for you, you can make up the ticket in cash and leave the station. Strictly enforce the regulations. In most cases, you may have to pay the fare of the highest subway network. Of course, if the subways in some cities trust you, they may make up your ticket directly according to the nearest station you mentioned.
Of course, if it's just turned out, it's evasion. ......
When using the "Transportation Alliance" card (the national transportation card standard of the Ministry of Transport), it is even more necessary to avoid leaving incomplete transactions, otherwise it will affect the use and return of the card locally and in other places, and it is also very troublesome to use the card in different places to deal with incomplete transactions.