axially symmetrical electron gun

例句：

1. 1.The design of the electron gun is crucial for the performance of the device.
   电子枪的设计对设备的性能至关重要。
2. 2. The electron gun was used to create a high-resolution image.
   电子枪被用来创建高分辨率图像。
3. 3. The electron gun was used in the manufacturing process of semiconductors.
   电子枪在半导体制造过程中被使用。