... blackout zone停电区域 diffraction zone衍射区 shadow zone盲区，阴影区 ...
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micro-zone electron diffraction 微区电子衍射
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The diameter of a thin wire was obtained by measuring the shadow in the Fresnel diffraction zone.
通过细丝后在其后菲涅耳衍射区留下阴影，测量阴影宽度可得细丝直径；
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