Taivo A Taiwan Mandarin dictionary

百年不遇

bǎiniánbùyù

ㄅㄞˇ ㄋㄧㄢˊ ㄅㄨˋ ㄩˋ

  1. 1only met with once every hundred years (drought, flood etc)

Keep 百年不遇 and it comes back until you know it.

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