pomiędzy

1. denotes movement; to in between
2. denotes location; between
3. denotes objects mutually affected by something; between, among

oboma

masculine/neuter/feminine instrumental plural of oba

się

• Pron

  1. reflexive pronoun; oneself, self
  2. each other, one another
  3. one's own home

• Particle

łuk

1. bow (weapon used for shooting arrows)
2. arc
3. arch

mostu

genitive singular of most