导火线dǎohuǒxiàn 1.使爆炸物爆炸的引线。{blasting fuse;}也叫also导火索{dǎohuǒsuǒ}。 2.〈比喻fig.〉直接引起事变爆发的事件{apparently insignificant incident leading to a major conflict}: 1914年奥国皇太子被刺事件,是第一次世界大战的～。{In 1914 the assassination of the Austrian crown prince touched off the First World War.}