In the field of ultra-precision measurement, tiny two-degree-of-freedom error information can be separated from moire fringe image generated by overlapping a pair of concentric-circle gratings.

在超精密测量领域中，通过处理同心圆光栅副迭合的莫尔条纹图像可以分离出二自由度的微小误差信息。

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If an impure object--and you will see here these overlapping pairs, if you can imagine the lower pair sort of being plunked down on top of this pair, that will give you an idea of what we're trying to convey with this image.

如果一个不纯洁的东西--看这里，这些重叠的单词，假设这两个单词,突然跑到这两个的上面，这样你就会对我们这个图示想传达的内容有个概念。

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