党首討論{とうしゅ とうろん}debate among party leaders: 党首討論{とうしゅ とうろん}debate between party leaders: 党首討論{とうしゅ とうろん}face-to-face debate between party leaders: 党首{とうしゅ}の直接討論{ちょくせつ とうろん}