flame kernel

例句：

1. 1.The fire burned fiercely, consuming everything in its path.
   火势猛烈，吞噬了它所经过的一切。
2. 2. The flame kernels are the source of heat in a fire.
   火焰内核是火的热源。
3. 3.The scientist studied the flame kernels to understand how they generate energy.
   科学家研究火焰内核，以了解它们是如何产生能量的。