今天我们要学的词是 once-in-a-lifetime. Once-in-a-lifetime 是千载难逢的意思。A once-in-a-lifetime experience 千载难逢的经历。President Barack Obama said the nuclear framework agreement reached last week with Iran represents a "once-in-a-lifetime" opportunity to bring some stability to the Middle East. 美国总统奥巴马说，上星期跟伊朗达成的核框架协议是一个可以给中东带来稳定的千载难逢的机会。好的，今天我们学习的词是 once-in-a-lifetime, once-in-a-lifetime, once-in-a-lifetime...