The occiput does not easily accommodate instrumentation because of access and spatial constraints.
由于入路及空间结构的限制，对枕骨进行固定并非易事。
Spatial directional relation is one of the basic spatial constraints which represent geometric distribution relations of spatial objects.
空间方向关系是一类描述空间目标间位置分布的基本空间约束。
Consistency checking of cardinal direction constraints is one of the essential issues in qualitative spatial reasoning.
基本方向约束的一致性判定是定性空间推理中的基本问题之一。
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