Questions & Answers about Obie książki leżą na stole.
Polish does not have articles like English the and a/an.
So Obie książki leżą na stole can naturally mean Both books are lying on the table, with definiteness understood from context.
Polish usually shows whether something is specific or general through:
- context
- word order
- stress/emphasis
- sometimes other words like ten / ta / to (this / that)
So you do not need a word for the here.