2) There is a special grammatical method in Chinese language—the words of locality which represent pure directions, thus act as the core of the "Spatial System".
2)汉语有一个特别的语法手段——方位词,代表着纯粹的方向场,从而成为“空间系统”的核心。
参考来源 - 现代汉语方位词“前、后、上、下”研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Chapter six: the evolution complexity of urban geographical spatial system.
第六章城市地理空间系统演化的复杂性。
It investigated a spatial system proposed by Mr. Qi Huyang, and argued that there is necessity to modify this system.
省视了齐沪扬先生已提出的一个空间系统体系，指出很有改进的必要。
Element combination form and self-balanced prestressed steel structure is a new spatial system composed by prestressed cable and strut elements.
“单元拼装式自平衡预应力空间钢结构”是由施加预应力的基本单元构成的新型空间结构体系。
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