类定义了导航网格的数据结构和状态。
The Navmesh class defines the structure and state of the navigation mesh.
它是与探测器相对的功能，用于清除数据结构和状态。
It is the counterpart of probe and is used to clean up any data structure and state.
锁定可以确保每个CPU的数据结构和状态始终受到保护而不被抢占。
Locking should ensure both that per-CPU data structures and state are always protected against preemption.
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