[千载难逢 / 千載難逢, qiān zǎi nán féng, ㄑㄧㄢ ㄗㄞˇ ㄋㄢˊ ㄈㄥˊ]lit. hard to meet in a thousand years (成语 saw); extremely rare opportunity; once in a blue moon#32163[Add to Longdo]
[万年历 / 萬年歷, wàn nián lì, ㄨㄢˋ ㄋㄧㄢˊ ㄌㄧˋ]ten thousand year calendar; Islamic calendar introduced to Yuan China by Jamal al-Din 紮馬剌丁|扎马剌丁#67910[Add to Longdo]