写作资料技巧|perfectly safe万无一失

万无一失，汉语成语，比喻十分稳妥，绝对不会出差错。可以翻译为guarantee complete success; no risk at all; nothing will go wrong; perfectly^{1 safe等。}

例句：

由他掌舵，通过这段激流险滩是万无一失的。

With him at the helm, we are a hundred percent safe crossing these treacherous^{2 rapids.}

为确保万无一失，一架警用直升机一直在空中警戒。

To make extra certain, a police helicopter kept watching from the sky.