Hanzi
百无一失
百无一失
百无一失
百无一失
百无一失
百无一失
百无一失
百无一失
百无一失
百无一失

bǎi百wú无yī一shī失

Absolutely foolproof; perfectly safe; no possibility of error.

经过反复检查，他们确保了这次演示百无一失。
After repeated checks, they ensured this presentation would be absolutely foolproof.
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