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。
This paper also extends a role-based authorization constraint model to describe constraints with spatial character on different levels, which is suited for wireless network.
对角色的授权约束加入空间特性，使之能够形式化描述多个层面的空间职责分离约束，从而适用于无线网络的应用环境。
Thus, the urban constraints disappear in the spatial resolution which offers a generous welcome to the disadvantaged population occupying the social residence.
这些使城市的空间方案对居住于此的弱势群体表现出慷慨的欢迎态度，从而使其约束感随之消失了。
The epigenome contains additional information that is not brought by DNA sequence, and generates spatial and functional constraints that complement genetic instructions.
表观遗传包括很多信息并没有出现在DNA序列之中，在发育过程中环境限制了一部分基因的表达。
The epigenome contains additional information that is not brought by DNA sequence, and generates spatial and functional constraints that complement genetic instructions.
表观遗传包括很多信息并没有出现在DNA序列之中，在发育过程中环境限制了一部分基因的表达。
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