<prompt> Translate the following text to EnglishMatofali hayo hutengenezwa kwa mianzi inayopatikana katika maeneo ya mashambani na yanaweza kutumiwa kwa miezi minne tu kabla ya kubadilishwa.  <response>: The rafts are made of bamboo from the surrounding countryside and can be used for only four months before they have to be replaced. 