no danger of anything going wrong;be on the safe side;... cannot fail under any circumstances;guarantee complete success ;

At present, absolutely safe schemes are being investigated and compared.
目前, 万无一失的方案正在探索和比较中.
来源:互联网摘选To make extra certain, a police helicopter kept watch from the skies.
为确保万无一失,一架警用直升机一直在空中警戒。
来源:《柯林斯高阶英汉双解学习词典》Trust me, monsieur; if he comes back-that young man-he shall have your letter without fail.
真的, 先生; 要是他回来了 — 那个青年 — 他一定会收到你的信的,万无一失.
来源:词典精选例句With him at the helm, we are a hundred percent safe crossing these treacherous rapids.
由他掌舵, 通过这段激流险滩是万无一失的.
来源:《现代汉英综合大词典》
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