比如：The cylinder wall shall be examined using UE transducers capable of detecting the specified calibration notches. The examination shall cover longitudinal defects in both circumferential directions (clockwise and anti-clockwise) and transverse defects in both longitudinal directions (forward and backward) and consider these defects to be located on the internal and external surfaces.
还有有的图示中出现了UE signal trace from calibration specimen wall
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