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Open the tool →以防万一 (yǐ fáng wàn yī) is a Chinese idiom (chengyu) meaning “to be prepared for any eventuality”.
以防万一 is pronounced yǐ fáng wàn yī in Mandarin Chinese.
Literally, 以防万一 means “to guard against the one in ten thousand chance”. It is used to mean “to be prepared for any eventuality”.
万一:意外变化。用以防备难以预料的事情。