...,自19世纪末,人们开始用blue moon来形容“罕见、不常发生的事情”,与blue moon相关的短语还有once in a blue moon（千载难逢地）,例如：This is a chance once in a blue moon.（这可是个千载难逢的好机会.
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杭州虽然远离奥运举办地，但奥运会也将为杭州旅游业带来诸多“后续效应”和千载难逢的机遇。
Although Hangzhou is far from the hosting city, the local tourism can still benefit enormously from the Olympic Games with its follow-up effects and accompanying opportunities.
在上海世博会充满异国风情的展馆和园区背后，有许多不为人注目的高科技看点作为支持；正是这些“隐身”的科技确保了游客们安全便捷地参与这场千载难逢的盛事。
The exotic pavilions and parks of the Shanghai Expo are supported by invisible high technologies that will ensure visitors enjoy the experience of a lifetime in safety and convenience.
但是，当珍妮得到一个千载难逢的机会|迪成为来自地狱的室友，她拼命地试图摧毁珍妮的生活。
But when Janie gets the opportunity of a lifetime | Dee becomes the roommate from hell as she desperately tries to destroy Janie's life.
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