If you read here:

You can stay from 9 a. m. to 5 p. m. on weekdays.

You can't bring other books to the library.

You can only take two books from the shelf (书架) at a time. Please don't be noisy.

Please don't eat.

If you borrow books：

Everyone must use his or her own (自己的) card to borrow books. You can borrow three books at a time. You can keep the books for a week.

If you lose the books, you must pay for (赔偿) them.