听力原文：Now, text messaging is increasingly being used by UK hospitals to remind patients about outpatient appointments—and could potentially save the National Health Service millions of pounds every year. Ealing Hospital in West London sends 20 texts per day, reminding the patients in advance of the date and time of their appointment. Before using the text messaging system, the hospital relied solely on sending patients a letter as a reminder. Instead of sending patients a letter as a reminder, now most UK hospitals use short mes sages to remind the patients of appointments.