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Open the tool →万不一失 (wàn bù yī shī) is a Chinese idiom (chengyu) meaning “absolutely safe and reliable”.
万不一失 is pronounced wàn bù yī shī in Mandarin Chinese.
Literally, 万不一失 means “ten thousand times no mistake”. It is used to mean “absolutely safe and reliable”.
万:很多;失:差错。指非常有把握,绝对不会出差错