磁线圈将电子束聚焦成细小的点。
根据曲轴宽电子束聚焦理论，研究了一种用曲轴轨迹确定轴外点扩散分布的方法。
Based on the theory of wide electron beam focusing with curved axis, a method for determining the off-axis point spread distribution is studied using the trajectories with curved axis.
扫描电子显微镜是通过扫描聚焦在物体上的电子束来工作的。
The microscope works by scanning a focused beam of electrons across an object.
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