研究了下,在Reservation change 里说If you are a customer registered at the Trenitalia website, you can change date and time of your tickets with simultaneous place Booking (Eurostar Italia, Eurostar Italia Fast, Eurostar City Italia, Eurostar Italia Alta Velocità, Eurostar Italia Alta Velocità Fast, Intercity Plus, couchettes, WL, Excelsior, Excelsior E4, IC, ICN and Espressi only with the ticketless procedure ). 这是啥意思啊