filament cathode

例句：

1. 1.The electron microscope uses a filament cathode to create an image of the sample.
   电子显微镜使用一个细丝阴极来创建样品的图像。
2. 2. In the field of physics, filament cathodes are used in various applications such as X-ray tubes and spectrometers.
   在物理学领域，细丝阴极被用于各种应用，如X射线管和光谱仪。
3. 3. The filament cathode is crucial for maintaining the stability of the electric field.
   细丝阴极对于维持电场的稳定性至关重要。