nucleus of flame

例句：

1. 1. The firewas burning fiercely in the center ofthe room.
   房间里中心的火势猛烈燃烧。
2. 2.The scientist discovered a new element that hasa nucleus of flame.
   科学家发现了一种新元素，它有一个火焰核心。
3. 3.The firefighters were working to extinguish the nucleus offlame.
   消防员们正在努力扑灭火焰的核心。