In traditional methods geometrical quantity is measured by using spatial reference quantity, and the relationship between measured quantity and reference quantity is space-to-space.
传统几何量计量中一般以空间量作为基准量，被测量与基准量之间是空间对空间的关系。
In traditional methods geometrical quantity is measured by using spatial reference quantity, and the relationship between measured quantity and reference quantity is space-to-space.
传统几何量计量中一般以空间量作为基准量，被测量与基准量之间是空间对空间的关系。
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