然而，现有的电子束仪器售价昂贵，不适合大量生产。
The electron-beam instruments currently available, however, are very expensive and impractical for large-scale manufacturing.
这些结果可用于电子束器件、电子光学仪器和高能加速器中的聚焦或偏转或聚焦兼偏转元件的设计。
These results of this paper may be of use in designing focusing or deflection systems of electron ray devices, electron-optical instruments and high energy accelerators.
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