Extremely rare; once in a lifetime opportunity.
一千年里也难碰到一次。形容机会极其难得。
《南齐书·瘐杲之传》臣以凡庸，谬徼（侥）昌运，奖擢之厚，千载难逢。”唐·韩愈《潮州刺史谢上表》当此之际，所谓千载一时不可逢之嘉会。”
Winning the lottery is a once-in-a-lifetime chance, a qianzai nanfeng event.
Learn the next connected idiom: 千载难逢 (qiān zǎi nán féng) → 逢山开路 (féng shān kāi lù)
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