There is no infallible way to distinguish clinically between a solitary cyst and a potential malignant disease . 事实上，临床上并没有一种万无一失的方法，可区别一个孤立性囊肿和潜在性恶性瘤。
"now whoever comes," thinks she, "would never dream of looking there for the money, so surely it will be safe and sound. " “这下不管谁来，”她想，“他做梦也不会在那里找钱，这样就万无一失了。”
He had never been hunted by a bloodhound nor had he ever seen that brute's unerring instinct baffled by human cunning . 他从来没有被一只猎狗追逐过，也从没见过人的机灵战胜过那种动物的万无一失的本能。
I ' ve found a foolproof way / method of doing it 我找到一个做那件事的万无一失的方法。
Very good , very good , theyll be safe enough with me “好，好，她们在我这儿万无一失。
I ' m wearing black for the party it ' s always a safe bet 我穿黑色礼服参加聚会- -万无一失
That s why you should safeguard your belongings 这样，就万无一失了！
Don ' t lecture me ! you swore to me that this was fail - safe 别教训我！你向我发誓这是万无一失的
I need some reassurance . are you sure everything will be ok 我需要的是保证。你能保证万无一失吗？
