<prompt> Translate the following text to SwahiliConnections among the island chains are poor, with the exception of the ports of Piraeus and Rafina on the Greek mainland, which serve as transportation hubs for those who wish to travel from one chain of islands to another.  <response>: Kuna uhusiano mbaya kati ya visiwa, isipokuwa bandari za Piraeus na Rafina kwenye bara la Ugiriki, ambazo hutumika kama vituo vya usafiri kwa wale wanaotaka kusafiri kutoka kisiwa kimoja hadi kingine. 