What you want to ask is whether Sanshui Southwest Middle School Card can buy things in the library? You can't. According to the specific information query of Sanshui Southwest Middle School, the campus library only provides book lending service and does not sell books to the outside world. You can borrow books from the library with your school card, but you can't buy books, so you can't use the card of Sanshui Southwest Middle School to buy things in the library.