The wind, or fire meet tree-trunk enwinds climbing plants and have lowered down the branches of the tree and fire up to become crownfire.
当地面火遇到大风时，或树干上缠绕着爬蔓植物和有低垂下来的树枝，火便上升到树冠，成为树冠火。
2
The effects of moisture vaporization and organic matter pyrolysis on crownfire spreading are discussed, and the characteristic curves are obtained by numerical calculation.
通过数值分析，得到树冠火蔓延速度特性曲线，研究水份蒸发和有机物热解对树冠火蔓延速度的影响。
3
The Parks Service is adding another staircase in part to make it easier for visitors who climb the statue's stairs to the crown to exit quickly in case of a fire or other emergency.