Research on spatial relation representation mainly includes spatial topological relation, spatial cardinal direction relation and spatial distance relation.

对空间关系表示的研究主要包括空间拓扑关系、空间方向关系、空间距离关系三大类空间关系表示的研究。

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Trying to put more distance between AmerisourceBergen and rivals Cardinal Health (number two) and McKesson (number three), which have boosted margins by diversifying into medical devices and software.

FORBES: Easy Pill to Swallow