estes

these

libros

plural of libro

son

• Noun

  sound

• Verb

por

1. indicates motion
2. for (over a period of time)
3. about, around (near, in the vicinity of)
4. for (to obtain)
5. for (in exchange for)
6. for (on behalf of)
7. times, by, multiplied by
8. by (indicates the actor in a clause with its verb in the passive voice)
9. by, by means of
10. per