The wind, or fire meet tree-trunk enwinds climbing plants and have lowered down the branches of the tree and fire up to become crown fire.
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。
The effects of moisture vaporization and organic matter pyrolysis on crown fire 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。
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.
公园服务部正增添新的楼梯系统，以便于通过楼梯到达顶部的游客在火灾等紧急情况下能更快地逃生。
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.
公园服务部正增添新的楼梯系统，以便于通过楼梯到达顶部的游客在火灾等紧急情况下能更快地逃生。
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