千載〔-载〕 cin¹ zoi² {qiān zǎi}

A Thousand Years

千載一時〔-载-时〕 cin¹ zoi² jat¹ si⁴ {qiān zǎi yī shí}

once in a thousand years, which means a rare opportunity

千載難逢〔-载难-〕 cin¹ zoi² naan⁴ fung⁴ {qiān zǎi nán féng}

1. extremely rare (idiom)
2. once in a blue moon