动词短语 spark off 意思是引起，引发。
- Their decision sparked off a protest because people were very angry.
- If I comment on my girlfriend's new haircut it might spark off an argument.
这个词也可以用来形容引起人们积极的活动。
- The documentary sparked off an interest in astronomy.
值得注意的是，spark off 这个动词短语也经常以被动语态出现。
- The interest in the magic coin was sparked off by a demonstration of the game at a technology conference.
- The argument was sparked off by his comment about Mary's haircut.
