只有相对原始状态的材料才拥有兰德曼所需要的研究对象，因此他的研究小组必须使用利用电子束表面成像的扫描电子显微镜(下图)去寻找最好的珍珠层。
Only relatively pristine material has the goods Landman is after, so his team USES a scanning electron microscope (below), which utilizes a beam of electrons to image surfaces, to find the best nacre.
从常规扫描电子显微镜（SEM）的基本工作原理出发，列出了SEM成像信号产生的方式及特点。
Starting from the principle of conventional scanning electron microscope (SEM), the imaging signals used in SEM are listed.
本文是从扫描电子显微镜的成像原理出发，推导了有关阐明二次电子像理论分辨率的公式。
Based on the imaging principle of SEM, the equation for illustrating the theoretical resolution of secondary electron image has been deduced in this paper.
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