但这一梦想总是遇到可怕的障碍：几十年 — — 有的时候是几百年 — — 之久的民族对立一再将可以创造共同利润的能源一体化协议拒之门外。
But such dreams always hit a formidable obstacle: national rivalries that date back decades – in some cases centuries – and that repeatedly keep mutually profitable energy-integration agreements from being signed.