- It happens only once in a thousand years.; difficult to meet in a thousand years; only once in a lifetime; occurring only once in a thousand years; very rare; once in a blue moon:
a golden opportunity; the chance of a lifetime; an once-in-a-life-time opportunity千载难逢的机会
千载难逢的用法和样例：
例句
坐失这样的良机真是太傻了，这是千载难逢的好机会。
It would be foolish to let such an opportunity slip; it is the chance of a lifetime.
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