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scan·ning electron microscope AHD[skănʹĭng] D.J.[ˈskænɪŋ]K.K.[ˈskænɪŋ]n.（名词）abbr. SEM【缩写】- An electron microscope that forms a three-dimensional image on a cathode-ray tube by moving a beam of focused electrons across an object and reading both the electrons scattered by the object and the secondary electrons produced by it.扫描电子显微镜：一种电子显微镜，通过移动电子光束掠过物体表面并探测到物体放出的电子和亚电子，从而在阴极射线管上形成三维图像
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