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1.once-in-a-lifetime 千载难逢的
例句：I missed out on some once-in-a-lifetime trips. My fiancé went all over Europe in college and I am very jealous of her for it.
如果可以就去国外念书，我错过了许多次千载难逢的旅行机会，我未婚妻就曾在大学时游遍欧洲，对此我非常的妒忌。
2.take priority over 优先于
例句：When foreign literary works are translated into Chinese, the quality of Chinese versions should take priority over other considerations.
在对外来儿童文学作品进行大量译介的同时，应当注意译本的质量。
adj. 独一无二的，独特的，稀罕的
