出发前再检查一遍装备,确保万无一失。Chūfā qián zài jiǎnchá yí biàn zhuāngbèi, quèbǎo wànwúyīshī.Check the equipment once more before setting out, to make sure everything is foolproof.
这套方案经过反复测试,执行起来万无一失。Zhè tào fāng'àn jīngguò fǎnfù cèshì, zhíxíng qǐlái wànwúyīshī.This plan has been tested again and again; it can be carried out without a single failure.
会计把每个数字都核对了两遍,记账万无一失。Kuàijì bǎ měi gè shùzì dōu hèduìle liǎng biàn, jìzhàng wànwúyīshī.The accountant checked every figure twice, so the bookkeeping was error-free.