<prompt> Translate the following text to SwahiliThis 1971 document affirmed the true presence of Christ in the Eucharist, effectually signified by the bread and wine, which, in this mystery, become his body and blood.  <response>: Hati hiyo ya mwaka 1971 ilithibitisha uwepo wa kweli wa Kristo katika Ekaristi, unaofanywa wazi kwa mkate na divai, ambazo katika fumbo hili zinakuwa mwili na damu yake. 