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万无一失
wàn wú yī shī
surefire; absolutely safe (idiom)
HSK 7-9 (v3.0)
Examples
确保万无一失。
Quèbǎo wànwúyīshī.
Ensure nothing goes wrong.
万无一失的计划。
Wànwúyīshī de jìhuà.
Foolproof plan.