Abran sus libros. (Formal Plural/Uds command)
Abra su libro. (Formal Singular/Ud command)
Abre tu libro. (Informal Singular/tú command)
"Abran el libro, por favor" in Spanish means "Please open the book." It is a polite request for someone to open a book.
It means "Open".
To Open
Libro means book in Spanish.
"Abierto" in Spanish means "open" in English. It can refer to a door, a store, or a business that is currently open for business.
open book
el libro
For something to open on its on its on or by itself, or it can be to open something.
It means "open" (imperative, plural).
la cosa i know cause i have a spanish book right here with me.
I open the book
"The book is blue."