求翻译：5．试验样品可在试验的放置样架上自由移动但必须保证5个同心环须完全进入摄像视野。通常的测试是按5点法测量，取最大点的失真率为考核（图1）；同心圆环共5环，其中最内白环直径为60mm，其余白环以20mm直径增量从内向外依次递增最外环直径为140mm（图2）；是什么意思？

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5.test samples can be placed in the trial as the framework, but it is important to ensure that freedom of movement must be fully entered five concentric ring camera vision. The test is usually based on a 5 point from the measurement, the largest point for evaluating the distortion rate; concentric r

But 5. experimental samples may on the experimental laying aside type frame the free migration have to guarantee 5 concentric rings must enter the photograph field of vision completely.The usual test is according to 5 o'clock law surveys, takes the maximum point the distortion rate for the inspectio

5. Test samples can move freely on the place the test sample of 5 concentric rings must be guaranteed to be completely into the camera field of vision. Usually test is based on a 5 point measurement, distortion rate to maximize, to evaluation (Figure 1); concentric circular total 5 rings, one of the

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