That is, it can only manager the information over the plane constructed by X-Y axes but the Z axes. It is in essence a system based on the abstract symbol, so it can’t show the actual feeling of nature.
二维GIS本质上是基于抽象符号的系统，不能给人以自然界的真实感受。
参考来源 - 地理信息系统三维建模及可视化技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Think of a symbol as a name for some abstract concept.
可抽象地把symbol视为名称。
The Fairy Tern birds which are a national symbol in the Seychelles became more smooth and abstract.
这是一个国家的象征，在塞舌尔的童话鸥鸟变得更加顺畅和抽象。
ABSTRACT: As a symbol of Australian wine industry, Penfolds winery is Australia's most famous and largest winery.
摘要：奔富酒庄是澳大利亚最著名的葡萄酒庄，被看做是澳大利亚葡萄酒的象征。
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