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。

Consistency checking of cardinal direction constraints is one of the essential issues in qualitative spatial reasoning.

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此外还介绍了边缘点的梯度方向约束，给出了基于以上约束条件的边缘线匹配算法。

In addition, gradient direction constraint of edge point was introduced. Matching algorithm based on aforementioned constraints was proposed.

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在虚拟化的所有层次和所有方向上的努力造就了相关的软件，它们能够让科学走在人为约束(在许多计算环境中是很常见的)的前面。

Diligence in virtualization at all levels and in all directions has resulted in software that puts science before the artificial constraints common in many computing environments.

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