incendiary agent

例句：

1. 1.The incendiary agent was responsible for the fire.
   纵火犯是这场火灾的罪魁祸首。
2. 2.The arsonist set the building on fire.
   纵火者放火烧了那座大楼。
3. 3.The pyromaniac was caught red-handed by the police.
   纵火癖者被警察当场抓获。