The format also supports multipart shapes in three dimensions, as well as a measurement (m) dimension. The format consists of at least three individual files

此格式还支持三维多部分图形，还有度量（m）维。

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Phase shifting interferometry (PSI) is a high precise and sensitivity method in testing technology, especially in three-dimensions profile measurement.

移相干涉技术(PSI)是计量测试特别是三维形貌测量中高精度、高灵敏度的测量方法。

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