万无一失 (wàn wú yì shī): Absolutely reliable / Without any risk of failure — Meaning & Stroke Order

This plan has been repeatedly scrutinized to ensure it is absolutely reliable.

To ensure the surgery is absolutely reliable, the expert team conducted multiple preoperative simulations.

Are you sure this backup plan is truly without any risk of failure?

This security deployment is meticulous and rigorous, striving to achieve absolute reliability.