“以防万一”意思是指用以防备难以预料的事情，英语一般会说：on the safe side。它可用作副词，或者形容词。 on the safe side在词典中的英文释义是： being especially careful; taking no risks 即：谨慎为是；不冒险；以防万一。 举几个例子： I took some extra cash just to be on the safe side. 我多带了一些现金，以防万一。 The typhoon is not supposed to be very severe, but to be on the safe side, let’s put tape on the windows. 飓风不会很强烈，但为了以防万一，我们还是在窗户上贴上胶带吧！ 本文来源：https://www.wddqw.com/doc/4e7cd4940f22590102020740be1e650e52eacf85.html