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        <description>Relativity SCAD

Relativity SCAD不是独立语言，只是OpenSCAD的library，但是它提供了一套全新的API替换掉OpenSCAD原有的API的大部分功能，使用起来比OpenSCAD API简单很多。

特别之处：

	*  通过描述对象之间的相对位置，大大简化了OpenSCAD建模中繁琐的transformation</description>
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