Knowledge can be either declarative or procedural. Knowing that aircraft come into a sector at certain altitudes and have to leave the sector at other altitudes is declarative knowledge.

• 知识可以分为陈述性知识和程序性知识，知道一架飞机以一个特定的高度进入一个扇区和以另一个高度离开这个扇区，这是陈述性的知识。